diff --git a/core/src/main/java/hexagonal/core/domain/Member.java b/core/src/main/java/hexagonal/core/domain/Member.java
index 5b51d47..7008204 100644
--- a/core/src/main/java/hexagonal/core/domain/Member.java
+++ b/core/src/main/java/hexagonal/core/domain/Member.java
@@ -18,6 +18,9 @@ public class Member {
     @Column(nullable = false, length = 100)
     private String name;
 
+    @Column(nullable = false, unique = true, length = 150)
+    private String email;
+
     @Column(nullable = false, length = 30)
     private MemberType type;