diff --git a/framey-application/member-service/src/main/java/framey/member/domain/constant/NicknameConstant.java b/framey-application/member-service/src/main/java/framey/member/domain/constant/NicknameConstant.java
new file mode 100644
index 0000000..e397788
--- /dev/null
+++ b/framey-application/member-service/src/main/java/framey/member/domain/constant/NicknameConstant.java
@@ -0,0 +1,16 @@
+package framey.member.domain.constant;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+import java.util.regex.Pattern;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public final class NicknameConstant {
+    public static final int MAX_NICKNAME_LENGTH = 10;
+    public static final Pattern EDGE_WHITESPACE = Pattern.compile(
+        "^[\\p{javaWhitespace}\\p{IsWhite_Space}]+|[\\p{javaWhitespace}\\p{IsWhite_Space}]+$"
+    );
+    public static final String BASE_NICKNAME = "framey";
+    public static final int SUFFIX_DIGITS = 4;
+}
diff --git a/framey-application/member-service/src/main/java/framey/member/domain/constant/Provider.java b/framey-application/member-service/src/main/java/framey/member/domain/constant/Provider.java
new file mode 100644
index 0000000..7eedcf5
--- /dev/null
+++ b/framey-application/member-service/src/main/java/framey/member/domain/constant/Provider.java
@@ -0,0 +1,7 @@
+package framey.member.domain.constant;
+
+public enum Provider {
+    GOOGLE,
+    KAKAO,
+    APPLE
+}
diff --git a/framey-application/member-service/src/main/java/framey/member/domain/exception/MemberErrorCode.java b/framey-application/member-service/src/main/java/framey/member/domain/exception/MemberErrorCode.java
new file mode 100644
index 0000000..af570d8
--- /dev/null
+++ b/framey-application/member-service/src/main/java/framey/member/domain/exception/MemberErrorCode.java
@@ -0,0 +1,17 @@
+package framey.member.domain.exception;
+
+import framey.common.response.ErrorCode;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+
+@Getter
+@RequiredArgsConstructor
+public enum MemberErrorCode implements ErrorCode {
+    NICKNAME_REQUIRED("MB-001", "닉네임을 입력해 주세요.", HttpStatus.BAD_REQUEST),
+    MAX_NICKNAME_LENGTH("MB-002", "닉네임은 10자 이내로 입력해 주세요.", HttpStatus.BAD_REQUEST);
+
+    private final String value;
+    private final String message;
+    private final HttpStatus httpStatus;
+}
diff --git a/framey-application/member-service/src/main/java/framey/member/domain/model/Member.java b/framey-application/member-service/src/main/java/framey/member/domain/model/Member.java
new file mode 100644
index 0000000..0932dbb
--- /dev/null
+++ b/framey-application/member-service/src/main/java/framey/member/domain/model/Member.java
@@ -0,0 +1,112 @@
+package framey.member.domain.model;
+
+import framey.common.exception.BusinessException;
+import framey.common.jpa.BaseEntity;
+import framey.member.domain.constant.Provider;
+import framey.member.domain.exception.MemberErrorCode;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Column;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.UUID;
+
+import static framey.member.domain.constant.NicknameConstant.EDGE_WHITESPACE;
+import static framey.member.domain.constant.NicknameConstant.MAX_NICKNAME_LENGTH;
+
+@Entity
+@Table(
+    uniqueConstraints = {
+        @UniqueConstraint(name = "uk_member_provider", columnNames = {"provider", "provider_id"}),
+        @UniqueConstraint(name = "uk_member_nickname", columnNames = {"nickname"}),
+        @UniqueConstraint(name = "uk_member_email", columnNames = {"email"}),
+    }
+)
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Getter
+public class Member extends BaseEntity {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long memberId;
+
+    @Column(updatable = false, nullable = false)
+    @NotBlank
+    @Email
+    private String email;
+
+    @Column(length = MAX_NICKNAME_LENGTH, nullable = false)
+    @NotBlank
+    private String nickname;
+
+    @Column(updatable = false, unique = true, nullable = false)
+    private UUID entityId;
+
+    @Column(length = 2048, nullable = false)
+    @NotBlank
+    private String profileImageUrl;
+
+    @Column(updatable = false, nullable = false)
+    @NotBlank
+    private String providerId;
+
+    @Enumerated(EnumType.STRING)
+    @Column(updatable = false, nullable = false)
+    @NotNull
+    private Provider provider;
+
+    private Member(
+        String email,
+        String nickname,
+        String profileImageUrl,
+        String providerId,
+        Provider provider
+    ) {
+        this.email = email;
+        this.nickname = validateNickname(nickname);
+        this.profileImageUrl = profileImageUrl;
+        this.providerId = providerId;
+        this.provider = provider;
+        this.entityId = UUID.randomUUID();
+    }
+
+    public static Member signUp(
+        String email,
+        String nickname,
+        String profileImageUrl,
+        String providerId,
+        Provider provider
+    ) {
+        return new Member(email, nickname, profileImageUrl, providerId, provider);
+    }
+
+    private static String validateNickname(String nickname) {
+        if (nickname == null) {
+            throw new BusinessException(MemberErrorCode.NICKNAME_REQUIRED);
+        }
+
+        String stripedNickname = EDGE_WHITESPACE.matcher(nickname).replaceAll("");
+
+        if (stripedNickname.isEmpty()) {
+            throw new BusinessException(MemberErrorCode.NICKNAME_REQUIRED);
+        }
+
+
+        // NOTE: 유니코드 코드 포인트 기준으로 길이 검증
+        if (stripedNickname.codePointCount(0, stripedNickname.length()) > MAX_NICKNAME_LENGTH) {
+            throw new BusinessException(MemberErrorCode.MAX_NICKNAME_LENGTH);
+        }
+
+        return stripedNickname;
+    }
+}
diff --git a/framey-application/member-service/src/main/java/framey/member/domain/model/NicknameGenerator.java b/framey-application/member-service/src/main/java/framey/member/domain/model/NicknameGenerator.java
new file mode 100644
index 0000000..cc20430
--- /dev/null
+++ b/framey-application/member-service/src/main/java/framey/member/domain/model/NicknameGenerator.java
@@ -0,0 +1,47 @@
+package framey.member.domain.model;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+import java.util.Random;
+import java.util.concurrent.ThreadLocalRandom;
+
+import static framey.member.domain.constant.NicknameConstant.BASE_NICKNAME;
+import static framey.member.domain.constant.NicknameConstant.EDGE_WHITESPACE;
+import static framey.member.domain.constant.NicknameConstant.MAX_NICKNAME_LENGTH;
+import static framey.member.domain.constant.NicknameConstant.SUFFIX_DIGITS;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class NicknameGenerator {
+    public static String normalize(String nickname) {
+        if (nickname == null) {
+            return BASE_NICKNAME;
+        }
+
+        String stripedNickname = EDGE_WHITESPACE.matcher(nickname).replaceAll("");
+
+        if (stripedNickname.isEmpty()) {
+            return BASE_NICKNAME;
+        }
+
+        return truncate(stripedNickname, MAX_NICKNAME_LENGTH);
+    }
+
+    public static String appendSuffix(String base) {
+        int baseLength = base.codePointCount(0, base.length());
+        int suffixLength = Math.max(SUFFIX_DIGITS, MAX_NICKNAME_LENGTH - baseLength);
+
+        StringBuilder nickname = new StringBuilder(truncate(base, MAX_NICKNAME_LENGTH - suffixLength));
+        for (int i = 0; i < suffixLength; i++) {
+            nickname.append(ThreadLocalRandom.current().nextInt(10));
+        }
+        return nickname.toString();
+    }
+
+    private static String truncate(String value, int maxLength) {
+        if (value.codePointCount(0, value.length()) <= maxLength) {
+            return value;
+        }
+        return value.substring(0, value.offsetByCodePoints(0, maxLength));
+    }
+}
diff --git a/framey-application/member-service/src/test/java/framey/member/domain/member/MemberTest.java b/framey-application/member-service/src/test/java/framey/member/domain/member/MemberTest.java
new file mode 100644
index 0000000..64ae982
--- /dev/null
+++ b/framey-application/member-service/src/test/java/framey/member/domain/member/MemberTest.java
@@ -0,0 +1,73 @@
+package framey.member.domain.member;
+
+import framey.common.exception.BusinessException;
+import framey.member.domain.constant.Provider;
+import framey.member.domain.model.Member;
+import framey.member.domain.exception.MemberErrorCode;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class MemberTest {
+
+    @ParameterizedTest
+    @ValueSource(strings = {" ", "    ", "\u3000"})
+    @NullAndEmptySource
+    @DisplayName("닉네임이 비어 있거나 null이면 가입할 수 없다")
+    void signUpFailWhenNicknameIsBlank(String nickname) {
+        Assertions.assertThatThrownBy(() ->
+                Member.signUp("framey@test.com", nickname, "", "test-1", Provider.GOOGLE)
+            )
+            .isInstanceOf(BusinessException.class)
+            .extracting("errorCode")
+            .isEqualTo(MemberErrorCode.NICKNAME_REQUIRED);
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {" Framey ", "\u3000Framey\u3000"})
+    @DisplayName("닉네임에 공백(유니코드 공백 포함)이 있으면 제거된다")
+    void signUpStripsNicknameWhitespace(String nickname) {
+        Member member = Member.signUp("framey@test.com", nickname, "", "test-1", Provider.GOOGLE);
+
+        Assertions.assertThat(member.getEntityId()).isNotNull();
+        Assertions.assertThat(member.getNickname()).isEqualTo(nickname.strip());
+    }
+
+    @Test
+    @DisplayName("닉네임이 10자 이내면 가입할 수 있다")
+    void signUpSuccessWhenNicknameIsWithinMaxLength() {
+        String nickname = "0123456789";
+        Member member = Member.signUp("framey@test.com", nickname, "", "test-1", Provider.GOOGLE);
+
+        Assertions.assertThat(nickname.length()).isEqualTo(10);
+        Assertions.assertThat(member.getNickname()).isEqualTo(nickname);
+        Assertions.assertThat(member.getEntityId()).isNotNull();
+    }
+
+    @Test
+    @DisplayName("닉네임의 이모지는 1글자로 센다")
+    void signUpCountsEmojiAsOneChar() {
+        String nickname = "🙂🙂🙂🙂🙂🙂🙂🙂🙂🙂";
+        Member member = Member.signUp("framey@test.com", nickname, "", "test-1", Provider.GOOGLE);
+
+        Assertions.assertThat(nickname.codePointCount(0, nickname.length())).isEqualTo(10);
+        Assertions.assertThat(member.getNickname()).isEqualTo(nickname);
+        Assertions.assertThat(member.getEntityId()).isNotNull();
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"01234567890", "🙂🙂🙂🙂🙂🙂🙂🙂🙂🙂🙂"})
+    @DisplayName("닉네임 길이는 10자를 초과할 수 없다")
+    void signUpFailWhenNicknameOverMaxLength(String nickname) {
+        Assertions.assertThat(nickname.codePointCount(0, nickname.length())).isEqualTo(11);
+        Assertions.assertThatThrownBy(() ->
+                Member.signUp("framey@test.com", nickname, "", "test-1", Provider.GOOGLE)
+            )
+            .isInstanceOf(BusinessException.class)
+            .extracting("errorCode")
+            .isEqualTo(MemberErrorCode.MAX_NICKNAME_LENGTH);
+    }
+}
diff --git a/framey-application/member-service/src/test/java/framey/member/domain/member/NicknameGeneratorTest.java b/framey-application/member-service/src/test/java/framey/member/domain/member/NicknameGeneratorTest.java
new file mode 100644
index 0000000..af8052f
--- /dev/null
+++ b/framey-application/member-service/src/test/java/framey/member/domain/member/NicknameGeneratorTest.java
@@ -0,0 +1,34 @@
+package framey.member.domain.member;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import static framey.member.domain.model.NicknameGenerator.appendSuffix;
+import static framey.member.domain.model.NicknameGenerator.normalize;
+
+class NicknameGeneratorTest {
+    @ParameterizedTest
+    @ValueSource(strings = {" ", "\u3000", "\u00A0"})
+    @NullAndEmptySource
+    @DisplayName("닉네임이 비어있을 경우 기본 닉네임을 사용한다")
+    void useDefaultNicknameWhenNicknameIsBlank(String nickname) {
+        String generatedNickname = appendSuffix(normalize(nickname));
+
+        Assertions.assertThat(generatedNickname).isNotBlank();
+        Assertions.assertThat(generatedNickname).matches("^framey\\d{4}$");
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = { " 프레이미 ", " 프레이미", "프레이미 ", "\u3000프레이미\u3000"})
+    @DisplayName("닉네임의 공백을 제거한다.")
+    void stripsNicknameWhiteSpaces(String nickname) {
+        String generatedNickname = normalize(nickname);
+
+        Assertions.assertThat(generatedNickname).isNotBlank();
+        Assertions.assertThat(generatedNickname).isEqualTo("프레이미");
+    }
+
+}