diff --git a/block.go b/block.go
index c6653b9..0d61197 100644
--- a/block.go
+++ b/block.go
@@ -16,7 +16,7 @@ func (bID BlockID) String() string {
 
 type BlockService interface {
 	GetChildren(context.Context, BlockID, *Pagination) (*GetChildrenResponse, error)
-	AppendChildren(context.Context, BlockID, *AppendBlockChildrenRequest) (Block, error)
+	AppendChildren(context.Context, BlockID, *AppendBlockChildrenRequest) (*AppendBlockChildrenResponse, error)
 	Get(context.Context, BlockID) (Block, error)
 	Update(ctx context.Context, id BlockID, request *BlockUpdateRequest) (Block, error)
 }
@@ -67,18 +67,18 @@ type GetChildrenResponse struct {
 }
 
 // AppendChildren https://developers.notion.com/reference/patch-block-children
-func (bc *BlockClient) AppendChildren(ctx context.Context, id BlockID, requestBody *AppendBlockChildrenRequest) (Block, error) {
+func (bc *BlockClient) AppendChildren(ctx context.Context, id BlockID, requestBody *AppendBlockChildrenRequest) (*AppendBlockChildrenResponse, error) {
 	res, err := bc.apiClient.request(ctx, http.MethodPatch, fmt.Sprintf("blocks/%s/children", id.String()), nil, requestBody)
 	if err != nil {
 		return nil, err
 	}
 
-	var response map[string]interface{}
+	var response AppendBlockChildrenResponse
 	err = json.NewDecoder(res.Body).Decode(&response)
 	if err != nil {
 		return nil, err
 	}
-	return decodeBlock(response)
+	return &response, nil
 }
 
 // Get https://developers.notion.com/reference/retrieve-a-block
@@ -532,6 +532,37 @@ func (b UnsupportedBlock) GetType() BlockType {
 	return b.Type
 }
 
+type AppendBlockChildrenResponse struct {
+	Object  ObjectType `json:"object"`
+	Results []Block    `json:"results"`
+}
+
+type appendBlockResponse struct {
+	Object  ObjectType               `json:"object"`
+	Results []map[string]interface{} `json:"results"`
+}
+
+func (r *AppendBlockChildrenResponse) UnmarshalJSON(data []byte) error {
+	var raw appendBlockResponse
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return err
+	}
+	blocks := make([]Block, 0)
+	for _, b := range raw.Results {
+		block, err := decodeBlock(b)
+		if err != nil {
+			return err
+		}
+		blocks = append(blocks, block)
+	}
+
+	*r = AppendBlockChildrenResponse{
+		Object:  raw.Object,
+		Results: blocks,
+	}
+	return nil
+}
+
 func decodeBlock(raw map[string]interface{}) (Block, error) {
 	var b Block
 	switch BlockType(raw["type"].(string)) {
diff --git a/block_test.go b/block_test.go
index 3f35fca..5dc4c36 100644
--- a/block_test.go
+++ b/block_test.go
@@ -2,6 +2,7 @@ package notionapi_test
 
 import (
 	"context"
+	"encoding/json"
 	"github.com/jomei/notionapi"
 	"net/http"
 	"reflect"
@@ -58,12 +59,12 @@ func TestBlockClient(t *testing.T) {
 			statusCode int
 			id         notionapi.BlockID
 			request    *notionapi.AppendBlockChildrenRequest
-			want       *notionapi.ChildPageBlock
+			want       *notionapi.AppendBlockChildrenResponse
 			wantErr    bool
 			err        error
 		}{
 			{
-				name:       "returns blocks by id of parent block",
+				name:       "return list object",
 				id:         "some_id",
 				filePath:   "testdata/block_append_children.json",
 				statusCode: http.StatusOK,
@@ -83,17 +84,29 @@ func TestBlockClient(t *testing.T) {
 						},
 					},
 				},
-				want: &notionapi.ChildPageBlock{
-					Object:         notionapi.ObjectTypeBlock,
-					ID:             "some_id",
-					Type:           notionapi.BlockTypeChildPage,
-					CreatedTime:    &timestamp,
-					LastEditedTime: &timestamp,
-					HasChildren:    true,
-					ChildPage: struct {
-						Title string `json:"title"`
-					}{
-						Title: "Hello",
+				want: &notionapi.AppendBlockChildrenResponse{
+					Object: notionapi.ObjectTypeList,
+					Results: []notionapi.Block{
+						notionapi.ParagraphBlock{
+							Object:         notionapi.ObjectTypeBlock,
+							ID:             "some_id",
+							CreatedTime:    &timestamp,
+							LastEditedTime: &timestamp,
+							Type:           notionapi.BlockTypeParagraph,
+							Paragraph: notionapi.Paragraph{
+								Text: []notionapi.RichText{
+									{
+										Type: notionapi.ObjectTypeText,
+										Text: notionapi.Text{Content: "AAAAAA"},
+										Annotations: &notionapi.Annotations{
+											Bold:  true,
+											Color: notionapi.ColorDefault,
+										},
+										PlainText: "AAAAAA",
+									},
+								},
+							},
+						},
 					},
 				},
 			},
@@ -104,12 +117,22 @@ func TestBlockClient(t *testing.T) {
 				c := newMockedClient(t, tt.filePath, tt.statusCode)
 				client := notionapi.NewClient("some_token", notionapi.WithHTTPClient(c))
 				got, err := client.Block.AppendChildren(context.Background(), tt.id, tt.request)
-
 				if (err != nil) != tt.wantErr {
 					t.Errorf("AppendChidlren() error = %v, wantErr %v", err, tt.wantErr)
 					return
 				}
-				if !reflect.DeepEqual(got, tt.want) {
+				a, err := json.Marshal(got)
+				if err != nil {
+					t.Errorf("AppendChidlren() marhall error = %v", err)
+					return
+				}
+				b, err := json.Marshal(tt.want)
+				if err != nil {
+					t.Errorf("AppendChidlren() marhall error = %v", err)
+					return
+				}
+
+				if !(string(a) == string(b)) {
 					t.Errorf("AppendChidlren() got = %v, want %v", got, tt.want)
 				}
 			})
diff --git a/testdata/block_append_children.json b/testdata/block_append_children.json
index bcd0d5e..3011dfc 100644
--- a/testdata/block_append_children.json
+++ b/testdata/block_append_children.json
@@ -1,11 +1,37 @@
 {
-  "object": "block",
-  "id": "some_id",
-  "created_time": "2021-05-24T05:06:34.827Z",
-  "last_edited_time": "2021-05-24T05:06:34.827Z",
-  "has_children": true,
-  "type": "child_page",
-  "child_page": {
-    "title": "Hello"
-  }
-}
+  "object": "list",
+  "results": [
+    {
+      "object": "block",
+      "id": "some_id",
+      "created_time": "2021-05-24T05:06:34.827Z",
+      "last_edited_time": "2021-05-24T05:06:34.827Z",
+      "has_children": false,
+      "archived": false,
+      "type": "paragraph",
+      "paragraph": {
+        "text": [
+          {
+            "type": "text",
+            "text": {
+              "content": "AAAAAA",
+              "link": null
+            },
+            "annotations": {
+              "bold": true,
+              "italic": false,
+              "strikethrough": false,
+              "underline": false,
+              "code": false,
+              "color": "default"
+            },
+            "plain_text": "AAAAAA",
+            "href": null
+          }
+        ]
+      }
+    }
+  ],
+  "next_cursor": null,
+  "has_more": false
+}
\ No newline at end of file