diff --git a/resources/testfields.d.ts b/resources/testfields.d.ts
index d24bfaa4..784fa476 100644
--- a/resources/testfields.d.ts
+++ b/resources/testfields.d.ts
@@ -18,9 +18,9 @@ declare namespace kintone.types {
     Group_selection: kintone.fieldTypes.GroupSelect;
     Attachment: kintone.fieldTypes.File;
     Table: {
-      type: "SUBTABLE";
+      type?: "SUBTABLE";
       value: {
-        id: string;
+        id?: string;
         value: {
           Text_Table: kintone.fieldTypes.SingleLineText;
           Rich_text_Table: kintone.fieldTypes.RichText;
@@ -31,9 +31,9 @@ declare namespace kintone.types {
       }[];
     };
     Table_0: {
-      type: "SUBTABLE";
+      type?: "SUBTABLE";
       value: {
-        id: string;
+        id?: string;
         value: {
           Radio_button_Table: kintone.fieldTypes.RadioButton;
           Drop_down_Table: kintone.fieldTypes.DropDown;
diff --git a/src/templates/expressions/fields.test.ts b/src/templates/expressions/fields.test.ts
index e881decb..ced94617 100644
--- a/src/templates/expressions/fields.test.ts
+++ b/src/templates/expressions/fields.test.ts
@@ -102,9 +102,9 @@ describe("SubTableField", () => {
         ).toEqual(
             `
 "fieldName" : {
-    type: "SUBTABLE";
+    type?: "SUBTABLE";
     value: {
-        id: string;
+        id?: string;
         value: {
             
         }
diff --git a/src/templates/expressions/fields.ts b/src/templates/expressions/fields.ts
index f225def4..f9d89917 100644
--- a/src/templates/expressions/fields.ts
+++ b/src/templates/expressions/fields.ts
@@ -51,9 +51,9 @@ export class SubTableField implements TsExpression {
     tsExpression(): string {
         return `
 "${this.fieldName}" : {
-    type: "${this.fieldType}";
+    type?: "${this.fieldType}";
     value: {
-        id: string;
+        id?: string;
         value: {
             ${this.fieldGroup.tsExpression()}
         }