diff --git a/DOCUMENT.md b/DOCUMENT.md
index 912040e..ce6f4cc 100644
--- a/DOCUMENT.md
+++ b/DOCUMENT.md
@@ -16,6 +16,12 @@
   - /group
     - [/list](#get-usergrouplist)
 
+## データタイプ
+
+| 名前 | 内容 | 説明 |
+|-----|------|-----|
+| Date | `yyyy/MM/dd HH:mm:ss` | 日付 |
+
 ## `GET` `/auth`
 ログインできているか確認する。
 
diff --git a/src/main/kotlin/com/kokasai/api/form/FormDefineFile.kt b/src/main/kotlin/com/kokasai/api/form/FormDefineFile.kt
new file mode 100644
index 0000000..1a3c568
--- /dev/null
+++ b/src/main/kotlin/com/kokasai/api/form/FormDefineFile.kt
@@ -0,0 +1,43 @@
+package com.kokasai.api.form
+
+import com.kokasai.api.util.serialize.DateSerializer
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import java.util.Date
+
+@Serializable
+data class FormDefineFile(
+    val name: String,
+    val description: String,
+    @Serializable(with = DateSerializer::class) val receive: Date,
+    @Serializable(with = DateSerializer::class) val limit: Date,
+    val values: Map<Int, FormDefineValue>,
+    val group: List<String>
+)
+
+@Serializable
+data class FormDefineValue(
+    val name: String,
+    val description: String,
+    val type: FormDefineType
+)
+
+@Serializable
+sealed class FormDefineType {
+    @Serializable
+    @SerialName("string")
+    object String : FormDefineType() {
+        const val name = "string"
+    }
+
+    @Serializable
+    @SerialName("check")
+    data class Check(
+        val element: Map<Int, kotlin.String>,
+        val limit: Int
+    ) : FormDefineType() {
+        companion object {
+            const val name = "check"
+        }
+    }
+}
diff --git a/src/main/kotlin/com/kokasai/api/form/FormGetFile.kt b/src/main/kotlin/com/kokasai/api/form/FormGetFile.kt
new file mode 100644
index 0000000..5553529
--- /dev/null
+++ b/src/main/kotlin/com/kokasai/api/form/FormGetFile.kt
@@ -0,0 +1,25 @@
+package com.kokasai.api.form
+
+import com.kokasai.api.util.serialize.DateSerializer
+import kotlinx.serialization.Serializable
+import java.util.Date
+
+@Serializable
+data class FormGetFile(
+    val name: String,
+    val description: String,
+    @Serializable(with = DateSerializer::class) val receive: Date,
+    @Serializable(with = DateSerializer::class) val limit: Date,
+    val values: Map<Int, FormGetValue>,
+    val comment: String,
+    val status: Int
+)
+
+@Serializable
+data class FormGetValue(
+    val name: String,
+    val description: String,
+    val type: FormDefineType,
+    val value: FormSaveValue,
+    val comment: String
+)
diff --git a/src/main/kotlin/com/kokasai/api/form/FormResponseFile.kt b/src/main/kotlin/com/kokasai/api/form/FormResponseFile.kt
new file mode 100644
index 0000000..6940026
--- /dev/null
+++ b/src/main/kotlin/com/kokasai/api/form/FormResponseFile.kt
@@ -0,0 +1,10 @@
+package com.kokasai.api.form
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class FormResponseFile(
+    val values: Map<Int, FormSaveType>,
+    val comment: String,
+    val status: Int
+)
diff --git a/src/main/kotlin/com/kokasai/api/form/FormSaveFile.kt b/src/main/kotlin/com/kokasai/api/form/FormSaveFile.kt
new file mode 100644
index 0000000..c14aa83
--- /dev/null
+++ b/src/main/kotlin/com/kokasai/api/form/FormSaveFile.kt
@@ -0,0 +1,28 @@
+package com.kokasai.api.form
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class FormSaveFile(
+    val values: Map<Int, FormSaveValue>,
+    val comment: String,
+    val status: Int
+)
+
+@Serializable
+data class FormSaveValue(
+    val value: FormSaveType,
+    val comment: String
+)
+
+@Serializable
+sealed class FormSaveType {
+    @Serializable
+    @SerialName("string")
+    data class String(val content: kotlin.String)
+
+    @Serializable
+    @SerialName("check")
+    data class Check(val select: List<Int>)
+}
diff --git a/src/main/kotlin/com/kokasai/api/form/FormSubmitFile.kt b/src/main/kotlin/com/kokasai/api/form/FormSubmitFile.kt
new file mode 100644
index 0000000..c4bafb4
--- /dev/null
+++ b/src/main/kotlin/com/kokasai/api/form/FormSubmitFile.kt
@@ -0,0 +1,8 @@
+package com.kokasai.api.form
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class FormSubmitFile(
+    val values: Map<Int, FormSaveType>
+)
diff --git a/src/main/kotlin/com/kokasai/api/util/serialize/DateSerializer.kt b/src/main/kotlin/com/kokasai/api/util/serialize/DateSerializer.kt
new file mode 100644
index 0000000..bb81de2
--- /dev/null
+++ b/src/main/kotlin/com/kokasai/api/util/serialize/DateSerializer.kt
@@ -0,0 +1,29 @@
+package com.kokasai.api.util.serialize
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.descriptors.PrimitiveKind
+import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import java.text.SimpleDateFormat
+import java.util.Date
+
+class DateSerializer : KSerializer<Date> {
+    override val descriptor: SerialDescriptor by lazy {
+        PrimitiveSerialDescriptor(
+            DateSerializer::class.qualifiedName!!,
+            PrimitiveKind.STRING
+        )
+    }
+
+    private val formatter = SimpleDateFormat("yyyy/MM/dd HH:mm:ss")
+
+    override fun serialize(encoder: Encoder, value: Date) {
+        encoder.encodeString(formatter.format(value))
+    }
+
+    override fun deserialize(decoder: Decoder): Date {
+        return formatter.parse(decoder.decodeString())
+    }
+}