diff --git a/docs/swagger/swagger.yaml b/docs/swagger/swagger.yaml
index 23d733e9..7bbea625 100644
--- a/docs/swagger/swagger.yaml
+++ b/docs/swagger/swagger.yaml
@@ -674,6 +674,8 @@ components:
               example: 1
             question_id:
               type: integer
+              description: |
+                質問を追加する場合はnull。
               example: 1
             created_at:
               type: string
@@ -681,22 +683,18 @@ components:
               example: 2020-01-01T00:00:00+09:00
           required:
             - questionnaire_id
-            - question_id
             - created_at
     QuestionBase:
       type: object
       properties:
-        title:
-          type: string
-        description:
+        body:
           type: string
         is_required:
           type: boolean
           description: |
             回答必須かどうか
       required:
-        - title
-        - description
+        - body
         - is_required
     QuestionSettingsByType:
       oneOf:
diff --git a/openapi/spec.go b/openapi/spec.go
index 7351397d..88e3e723 100644
--- a/openapi/spec.go
+++ b/openapi/spec.go
@@ -17,75 +17,74 @@ import (
 
 // Base64 encoded, gzipped, json marshaled Swagger object
 var swaggerSpec = []string{
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+	"DB0fcRab/+k5oKhm64MHcgdyA7KgHsI9yVUgCVWRy3OH8HMcMAraNBFiNniWMwWYmbKbCM5Z6QG42vph",
+	"bef9W6Tfar2bJRUxy4O5nfdvd97/tLM9T4yIP5GBGs9x2NqYQ/ot8+KoU26DZnWOMKkQTOCVyf0NaCe8",
+	"nPGey9IhzsRtkqWvq4U5frq55zZdAgL6KmqC5iG3ehNSht4Kx07MU2cwmMvZILSyD9TqzH6nmks02QW1",
+	"4OEiAboXGa2XPxrb2wi+sLVqHiN9smqlZvUgFsydi53KpVAww3OHTf6j0de4bDz6BcFN4+Nj48MCgs3d",
+	"u6/ImdV1sy/c0V9YHfl50W+Fs7+C9NvkJ56H2eOhYI+jJ77FjGyuttearWW9s3QbweYhFU/u7WXMNFy1",
+	"D8T1ne33CL5ovfyx/WShvbaxu/AJwaZxc9VYeURmT7KlU2qg+oc4raqsMtalc5UxODPzemXkKjsuq95l",
+	"Zt36BapmJ2F6AqTArb8Zr+fRlBqYCQD5YH+AbBXWRUE5XJh+cNvPzTqR1SDh7wnigUn4IB6Bvxne7yqy",
+	"F3231WdMXspAA0m4Mq5d7yyvR8JzmHTmB2g6N8C+oh9mNhPjwebej4dQ/Qat4Mgw1uqlNVJ98zSNSuGm",
+	"PXyzK2XybB8fHMZCYVceu8+a+ip2IczF7VXrh3OHExWluUejlr774eiivZCgFafTQWf9WmvlTSR0vimJ",
+	"fcRO791ZKGziPFpKG2NJ7ovYmDR89NZtZCt1s9JxVBO0WvgWpMtixq6M1zEvS380U+avHf2T2DSvutsb",
+	"L43N+/22bN2jrgu710fY9dkKMhG3F3PYL+P3NWDZZ/vpkWrCyM64vGFVdJlFSywr6a3kd4tATzrFDVi+",
+	"z961lq4aL+/hHb1ZAW1vUZIYWjff3iOwx+dTWF+qSpiGCX59rq82napL/FMYcAdrPbLY0RkRZ7RgIiQ4",
+	"C+cezu7LO8bCVrvxkXDhuc/QgTeNm++pDws27W2YuftPnGWhvgT4ezbwngKdL5uw8Y4bBny/gmOSM077",
+	"fuZk9rRqDg8OxhTyw6ZbuQ9XkQ69xftxK9AvO9jcY07IQQCJ4uP8kPPZTU9NsfOZztRHBMfq3fsPphvY",
+	"qzVPdZwbciocLM5Jb/sdmUal2pkIYXw9laGWBGhxqo/9QLnofmQyMmXoRibeTGFImrBroxr4ambK5GCA",
+	"T48ykhoXR9y2lWEbl0MJ5IQ3Ka2NZ6a5sK/r2bqyzd3hRFGiw5Rtfcjt1GbA+oTZs9xfurRnDGlGGjZX",
+	"iV2jNCQrGhEgs0xS/2H4BR1s2siS0gIrnowCb2fp1/aTp92DNwaJvY9HPcgJSR642EmWDOg1eHofE6YL",
+	"CJOZTdZO/0uaTWv8KOT9IWzmlzOVdB0QgaenAuiMWZpj19+MYyyqQDlnY9nLTlWRS7Ui+eEvkbGqW+hi",
+	"HEZVa1kuCmUPbT6bJQ+nZVXL/zX315xJOe7M5SLzg9ukb9+HsLmZ8Zn/CwAA///nbjGLtV8AAA==",
 }
 
 // GetSwagger returns the content of the embedded swagger specification file
diff --git a/openapi/types.go b/openapi/types.go
index ab4f9a46..f033c075 100644
--- a/openapi/types.go
+++ b/openapi/types.go
@@ -137,11 +137,10 @@ type Groups = []string
 
 // NewQuestion defines model for NewQuestion.
 type NewQuestion struct {
-	Description string `json:"description"`
+	Body string `json:"body"`
 
 	// IsRequired 回答必須かどうか
-	IsRequired bool   `json:"is_required"`
-	Title      string `json:"title"`
+	IsRequired bool `json:"is_required"`
 	union      json.RawMessage
 }
 
@@ -177,24 +176,24 @@ type NewResponse struct {
 
 // Question defines model for Question.
 type Question struct {
-	CreatedAt   time.Time `json:"created_at"`
-	Description string    `json:"description"`
+	Body      string    `json:"body"`
+	CreatedAt time.Time `json:"created_at"`
 
 	// IsRequired 回答必須かどうか
-	IsRequired      bool   `json:"is_required"`
-	QuestionId      int    `json:"question_id"`
-	QuestionnaireId int    `json:"questionnaire_id"`
-	Title           string `json:"title"`
+	IsRequired bool `json:"is_required"`
+
+	// QuestionId 質問を追加する場合はnull。
+	QuestionId      *int `json:"question_id,omitempty"`
+	QuestionnaireId int  `json:"questionnaire_id"`
 	union           json.RawMessage
 }
 
 // QuestionBase defines model for QuestionBase.
 type QuestionBase struct {
-	Description string `json:"description"`
+	Body string `json:"body"`
 
 	// IsRequired 回答必須かどうか
-	IsRequired bool   `json:"is_required"`
-	Title      string `json:"title"`
+	IsRequired bool `json:"is_required"`
 }
 
 // QuestionSettingsByType defines model for QuestionSettingsByType.
@@ -862,9 +861,9 @@ func (t NewQuestion) MarshalJSON() ([]byte, error) {
 		}
 	}
 
-	object["description"], err = json.Marshal(t.Description)
+	object["body"], err = json.Marshal(t.Body)
 	if err != nil {
-		return nil, fmt.Errorf("error marshaling 'description': %w", err)
+		return nil, fmt.Errorf("error marshaling 'body': %w", err)
 	}
 
 	object["is_required"], err = json.Marshal(t.IsRequired)
@@ -872,11 +871,6 @@ func (t NewQuestion) MarshalJSON() ([]byte, error) {
 		return nil, fmt.Errorf("error marshaling 'is_required': %w", err)
 	}
 
-	object["title"], err = json.Marshal(t.Title)
-	if err != nil {
-		return nil, fmt.Errorf("error marshaling 'title': %w", err)
-	}
-
 	b, err = json.Marshal(object)
 	return b, err
 }
@@ -892,10 +886,10 @@ func (t *NewQuestion) UnmarshalJSON(b []byte) error {
 		return err
 	}
 
-	if raw, found := object["description"]; found {
-		err = json.Unmarshal(raw, &t.Description)
+	if raw, found := object["body"]; found {
+		err = json.Unmarshal(raw, &t.Body)
 		if err != nil {
-			return fmt.Errorf("error reading 'description': %w", err)
+			return fmt.Errorf("error reading 'body': %w", err)
 		}
 	}
 
@@ -906,13 +900,6 @@ func (t *NewQuestion) UnmarshalJSON(b []byte) error {
 		}
 	}
 
-	if raw, found := object["title"]; found {
-		err = json.Unmarshal(raw, &t.Title)
-		if err != nil {
-			return fmt.Errorf("error reading 'title': %w", err)
-		}
-	}
-
 	return err
 }
 
@@ -1085,14 +1072,14 @@ func (t Question) MarshalJSON() ([]byte, error) {
 		}
 	}
 
-	object["created_at"], err = json.Marshal(t.CreatedAt)
+	object["body"], err = json.Marshal(t.Body)
 	if err != nil {
-		return nil, fmt.Errorf("error marshaling 'created_at': %w", err)
+		return nil, fmt.Errorf("error marshaling 'body': %w", err)
 	}
 
-	object["description"], err = json.Marshal(t.Description)
+	object["created_at"], err = json.Marshal(t.CreatedAt)
 	if err != nil {
-		return nil, fmt.Errorf("error marshaling 'description': %w", err)
+		return nil, fmt.Errorf("error marshaling 'created_at': %w", err)
 	}
 
 	object["is_required"], err = json.Marshal(t.IsRequired)
@@ -1100,9 +1087,11 @@ func (t Question) MarshalJSON() ([]byte, error) {
 		return nil, fmt.Errorf("error marshaling 'is_required': %w", err)
 	}
 
-	object["question_id"], err = json.Marshal(t.QuestionId)
-	if err != nil {
-		return nil, fmt.Errorf("error marshaling 'question_id': %w", err)
+	if t.QuestionId != nil {
+		object["question_id"], err = json.Marshal(t.QuestionId)
+		if err != nil {
+			return nil, fmt.Errorf("error marshaling 'question_id': %w", err)
+		}
 	}
 
 	object["questionnaire_id"], err = json.Marshal(t.QuestionnaireId)
@@ -1110,11 +1099,6 @@ func (t Question) MarshalJSON() ([]byte, error) {
 		return nil, fmt.Errorf("error marshaling 'questionnaire_id': %w", err)
 	}
 
-	object["title"], err = json.Marshal(t.Title)
-	if err != nil {
-		return nil, fmt.Errorf("error marshaling 'title': %w", err)
-	}
-
 	b, err = json.Marshal(object)
 	return b, err
 }
@@ -1130,17 +1114,17 @@ func (t *Question) UnmarshalJSON(b []byte) error {
 		return err
 	}
 
-	if raw, found := object["created_at"]; found {
-		err = json.Unmarshal(raw, &t.CreatedAt)
+	if raw, found := object["body"]; found {
+		err = json.Unmarshal(raw, &t.Body)
 		if err != nil {
-			return fmt.Errorf("error reading 'created_at': %w", err)
+			return fmt.Errorf("error reading 'body': %w", err)
 		}
 	}
 
-	if raw, found := object["description"]; found {
-		err = json.Unmarshal(raw, &t.Description)
+	if raw, found := object["created_at"]; found {
+		err = json.Unmarshal(raw, &t.CreatedAt)
 		if err != nil {
-			return fmt.Errorf("error reading 'description': %w", err)
+			return fmt.Errorf("error reading 'created_at': %w", err)
 		}
 	}
 
@@ -1165,13 +1149,6 @@ func (t *Question) UnmarshalJSON(b []byte) error {
 		}
 	}
 
-	if raw, found := object["title"]; found {
-		err = json.Unmarshal(raw, &t.Title)
-		if err != nil {
-			return fmt.Errorf("error reading 'title': %w", err)
-		}
-	}
-
 	return err
 }