diff --git a/src/main/kotlin/dev/usbharu/hideout/query/PostResponseQueryService.kt b/src/main/kotlin/dev/usbharu/hideout/query/PostResponseQueryService.kt
new file mode 100644
index 00000000..9386a4ce
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/hideout/query/PostResponseQueryService.kt
@@ -0,0 +1,26 @@
+package dev.usbharu.hideout.query
+
+import dev.usbharu.hideout.domain.model.hideout.dto.PostResponse
+
+@Suppress("LongParameterList")
+interface PostResponseQueryService {
+    suspend fun findById(id: Long, userId: Long): PostResponse
+    suspend fun findAll(
+        since: Long,
+        until: Long,
+        minId: Long,
+        maxId: Long,
+        limit: Long,
+        userId: Long
+    ): List<PostResponse>
+
+    suspend fun findByUserId(
+        userId: Long,
+        since: Long,
+        until: Long,
+        minId: Long,
+        maxId: Long,
+        limit: Long,
+        userId2: Long
+    ): List<PostResponse>
+}
diff --git a/src/main/kotlin/dev/usbharu/hideout/query/PostResponseQueryServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/query/PostResponseQueryServiceImpl.kt
new file mode 100644
index 00000000..858aa05f
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/hideout/query/PostResponseQueryServiceImpl.kt
@@ -0,0 +1,51 @@
+package dev.usbharu.hideout.query
+
+import dev.usbharu.hideout.domain.model.hideout.dto.PostResponse
+import dev.usbharu.hideout.repository.Posts
+import dev.usbharu.hideout.repository.Users
+import dev.usbharu.hideout.repository.toPost
+import dev.usbharu.hideout.repository.toUser
+import org.jetbrains.exposed.sql.innerJoin
+import org.jetbrains.exposed.sql.select
+import org.jetbrains.exposed.sql.selectAll
+import org.koin.core.annotation.Single
+
+@Single
+class PostResponseQueryServiceImpl : PostResponseQueryService {
+    override suspend fun findById(id: Long, userId: Long): PostResponse {
+        return Posts
+            .innerJoin(Users, onColumn = { Posts.userId }, otherColumn = { Users.id })
+            .select { Posts.id eq id }
+            .single()
+            .let { PostResponse.from(it.toPost(), it.toUser()) }
+    }
+
+    override suspend fun findAll(
+        since: Long,
+        until: Long,
+        minId: Long,
+        maxId: Long,
+        limit: Long,
+        userId: Long
+    ): List<PostResponse> {
+        return Posts
+            .innerJoin(Users, onColumn = { Posts.userId }, otherColumn = { id })
+            .selectAll()
+            .map { PostResponse.from(it.toPost(), it.toUser()) }
+    }
+
+    override suspend fun findByUserId(
+        userId: Long,
+        since: Long,
+        until: Long,
+        minId: Long,
+        maxId: Long,
+        limit: Long,
+        userId2: Long
+    ): List<PostResponse> {
+        return Posts
+            .innerJoin(Users, onColumn = { Posts.userId }, otherColumn = { id })
+            .select { Posts.userId eq userId }
+            .map { PostResponse.from(it.toPost(), it.toUser()) }
+    }
+}