diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetail.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetail.kt
index 7cd33a5f..183ec3e6 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetail.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetail.kt
@@ -42,6 +42,16 @@ class UserDetail(
     }
 
     override fun hashCode(): Int = id.hashCode()
+    override fun toString(): String {
+        return "UserDetail(" +
+                "id=$id, " +
+                "actorId=$actorId, " +
+                "password=$password, " +
+                "autoAcceptFolloweeFollowRequest=$autoAcceptFolloweeFollowRequest, " +
+                "lastMigration=$lastMigration, " +
+                "homeTimelineId=$homeTimelineId" +
+                ")"
+    }
 
     companion object {
         @Suppress("LongParameterList")
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailHashedPassword.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailHashedPassword.kt
index f0dc4399..8e5edf56 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailHashedPassword.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailHashedPassword.kt
@@ -17,4 +17,8 @@
 package dev.usbharu.hideout.core.domain.model.userdetails
 
 @JvmInline
-value class UserDetailHashedPassword(val password: String)
+value class UserDetailHashedPassword(val password: String) {
+    override fun toString(): String {
+        return "[MASKED]"
+    }
+}
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailId.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailId.kt
index cc048546..0641cd6e 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailId.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/userdetails/UserDetailId.kt
@@ -17,4 +17,8 @@
 package dev.usbharu.hideout.core.domain.model.userdetails
 
 @JvmInline
-value class UserDetailId(val id: Long)
+value class UserDetailId(val id: Long) {
+    override fun toString(): String {
+        return "UserDetailId(id=$id)"
+    }
+}