diff --git a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Instance.kt b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Instance.kt
index 1753ec00..f0599b7f 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Instance.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/instance/Instance.kt
@@ -1,5 +1,7 @@
 package dev.usbharu.hideout.core.domain.model.instance
 
+import java.time.Instant
+
 data class Instance(
     val id: Long,
     val name: String,
@@ -10,6 +12,7 @@ data class Instance(
     val software: String,
     val version: String,
     val isBlocked: Boolean,
-    val isMuting: Boolean,
-    val moderationNote: String
+    val isMuted: Boolean,
+    val moderationNote: String,
+    val createdAt: Instant
 )
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/InstanceRepositoryImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/InstanceRepositoryImpl.kt
new file mode 100644
index 00000000..642fd189
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/InstanceRepositoryImpl.kt
@@ -0,0 +1,88 @@
+package dev.usbharu.hideout.core.infrastructure.exposedrepository
+
+import dev.usbharu.hideout.core.domain.exception.FailedToGetResourcesException
+import dev.usbharu.hideout.core.domain.model.instance.InstanceRepository
+import dev.usbharu.hideout.util.singleOr
+import org.jetbrains.exposed.sql.*
+import org.jetbrains.exposed.sql.SqlExpressionBuilder.eq
+import org.jetbrains.exposed.sql.javatime.timestamp
+import org.springframework.stereotype.Repository
+import dev.usbharu.hideout.core.domain.model.instance.Instance as InstanceEntity
+
+@Repository
+class InstanceRepositoryImpl : InstanceRepository {
+    override suspend fun save(instance: InstanceEntity): InstanceEntity {
+        if (Instance.select { Instance.id.eq(instance.id) }.firstOrNull() == null) {
+            Instance.insert {
+                it[id] = instance.id
+                it[name] = instance.name
+                it[description] = instance.description
+                it[url] = instance.url
+                it[iconUrl] = instance.iconUrl
+                it[sharedInbox] = instance.sharedInbox
+                it[software] = instance.software
+                it[version] = instance.version
+                it[isBlocked] = instance.isBlocked
+                it[isMuted] = instance.isMuted
+                it[moderationNote] = instance.moderationNote
+                it[createdAt] = instance.createdAt
+            }
+        } else {
+            Instance.update({ Instance.id eq instance.id }) {
+                it[name] = instance.name
+                it[description] = instance.description
+                it[url] = instance.url
+                it[iconUrl] = instance.iconUrl
+                it[sharedInbox] = instance.sharedInbox
+                it[software] = instance.software
+                it[version] = instance.version
+                it[isBlocked] = instance.isBlocked
+                it[isMuted] = instance.isMuted
+                it[moderationNote] = instance.moderationNote
+                it[createdAt] = instance.createdAt
+            }
+        }
+        return instance
+    }
+
+    override suspend fun findById(id: Long): InstanceEntity {
+        return Instance.select { Instance.id eq id }
+            .singleOr { FailedToGetResourcesException("id: $id doesn't exist.") }.toInstance()
+    }
+
+    override suspend fun delete(instance: InstanceEntity) {
+        Instance.deleteWhere { Instance.id eq instance.id }
+    }
+}
+
+fun ResultRow.toInstance(): InstanceEntity {
+    return InstanceEntity(
+        id = this[Instance.id],
+        name = this[Instance.name],
+        description = this[Instance.description],
+        url = this[Instance.url],
+        iconUrl = this[Instance.iconUrl],
+        sharedInbox = this[Instance.sharedInbox],
+        software = this[Instance.software],
+        version = this[Instance.version],
+        isBlocked = this[Instance.isBlocked],
+        isMuted = this[Instance.isMuted],
+        moderationNote = this[Instance.moderationNote],
+        createdAt = this[Instance.createdAt]
+    )
+}
+
+object Instance : Table("instance") {
+    val id = long("id")
+    val name = varchar("name", 1000)
+    val description = varchar("description", 5000)
+    val url = varchar("url", 255)
+    val iconUrl = varchar("icon_url", 255)
+    val sharedInbox = varchar("shared_inbox", 255)
+    val software = varchar("software", 255)
+    val version = varchar("version", 255)
+    val isBlocked = bool("is_blocked")
+    val isMuted = bool("is_muted")
+    val moderationNote = varchar("moderation_note", 10000)
+    val createdAt = timestamp("created_at")
+}