diff --git a/repository/gorm/stamp.go b/repository/gorm/stamp.go
index 94bb9a67d..78d2fa20d 100644
--- a/repository/gorm/stamp.go
+++ b/repository/gorm/stamp.go
@@ -343,39 +343,3 @@ func (r *stampRepository) GetStampStats(stampID uuid.UUID) (*repository.StampSta
 	}
 	return &stats, nil
 }
-
-func (r *stampRepository) StampThumbnailExists(stamps []*model.Stamp) (stampsWithThumb []repository.StampWithThumbnail, err error) {
-	IDs := make([]uuid.UUID, len(stamps))
-
-	for i, s := range stamps {
-		IDs[i] = s.FileID
-	}
-	ts := []uuid.UUID{}
-	if err = r.db.
-		Table("files_thumbnails ft").
-		Select("file_id").
-		Where("file_id IN (?)", IDs).
-		Find(&ts).
-		Error; err != nil {
-		return stampsWithThumb, err
-	}
-	tm := make(map[uuid.UUID]struct{}, len(ts))
-	for _, v := range ts {
-		tm[v] = struct{}{}
-	}
-
-	for _, s := range(stamps) {
-		_, ok := tm[s.FileID]
-		stampsWithThumb = append(stampsWithThumb, repository.StampWithThumbnail{
-			ID: s.ID,
-			Name: s.Name,
-			CreatorID: s.CreatorID,
-			FileID: s.FileID,
-			IsUnicode: s.IsUnicode,
-			CreatedAt: s.CreatedAt,
-			UpdatedAt: s.UpdatedAt,
-			HasThumbnail: ok,
-		})
-	}
-	return
-}
diff --git a/repository/stamp.go b/repository/stamp.go
index 3564e926a..d9188a9fb 100644
--- a/repository/stamp.go
+++ b/repository/stamp.go
@@ -36,17 +36,6 @@ type StampStats struct {
 	TotalCount int64 `json:"totalCount"`
 }
 
-type StampWithThumbnail struct {
-	ID           uuid.UUID      `json:"id"`
-	Name         string         `json:"name"`
-	CreatorID    uuid.UUID      `json:"creatorId"`
-	FileID       uuid.UUID      `json:"fileId"`
-	IsUnicode    bool           `json:"isUnicode"`
-	CreatedAt    time.Time      `json:"createdAt"`
-	UpdatedAt    time.Time      `json:"updatedAt"`
-	HasThumbnail bool           `json:"hasThumbnail"`
-}
-
 // StampType スタンプの種類
 type StampType string
 
@@ -125,9 +114,4 @@ type StampRepository interface {
 	// stampIDにNILを渡した場合、(nil, ErrNilID)を返します。
 	// DBによるエラーを返すことがあります。
 	GetStampStats(stampID uuid.UUID) (*StampStats, error)
-	// StampThumbnailExists スタンプ情報にサムネイルの有無を示すbool値を付加した構造体の配列を返します
-	//
-	// 成功した場合、当該配列とnilを返します
-	// DBによるエラーを返すことがあります。
-	StampThumbnailExists(stamps []*model.Stamp) (stampsWithThumb []StampWithThumbnail, err error)
 }
diff --git a/router/v3/stamps.go b/router/v3/stamps.go
index 966d627b4..6f2991ee0 100644
--- a/router/v3/stamps.go
+++ b/router/v3/stamps.go
@@ -71,12 +71,7 @@ func (h *Handlers) GetStamps(c echo.Context) error {
 		return herror.InternalServerError(err)
 	}
 
-	stampsWithThumb, err := h.Repo.StampThumbnailExists(stamps)
-	if err != nil {
-		return herror.InternalServerError(err)
-	}
-
-	return extension.ServeJSONWithETag(c, stampsWithThumb)
+	return extension.ServeJSONWithETag(c, stamps)
 }
 
 // CreateStamp POST /stamps