diff --git a/ChangeLog.md b/ChangeLog.md
index 131f914..f24129a 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+### v1.3.1 / 2024-10-27
+
+  - Majiang.Board が配牌にドラがない・ドラが複数ある場合を処理できるよう修正
+
 ## v1.3.0 / 2024-10-19
 
   - Majiang.Board にメソッド last() を追加
diff --git a/README.md b/README.md
index c5ebb66..652bc32 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,7 @@ const Majiang = require('@kobalab/majiang-core');
 | ``Majiang.Board``   | 卓情報を更新するクラス               |
 | ``Majiang.Player``  | 対局者を実現する基底クラス           |
 
+## API仕様
 - [API仕様](https://github.com/kobalab/majiang-core/wiki)
 
 ## ライセンス
diff --git a/lib/board.js b/lib/board.js
index ea0b86f..4ffb076 100644
--- a/lib/board.js
+++ b/lib/board.js
@@ -11,7 +11,7 @@ const Majiang = {
 class Shan {
     constructor(baopai) {
         this.paishu = 136 - 13 * 4 - 14;
-        this.baopai = [ baopai ];
+        this.baopai = [].concat(baopai||[]);
         this.fubaopai;
     }
     zimo(p)         { this.paishu--; return p || '_' }
diff --git a/lib/index.js b/lib/index.js
index ec498bf..2867f8d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,5 +1,5 @@
 /*!
- *  @kobalab/majiang-core v1.3.0
+ *  @kobalab/majiang-core v1.3.1
  *
  *  Copyright(C) 2021 Satoshi Kobayashi
  *  Released under the MIT license
diff --git a/package-lock.json b/package-lock.json
index 473aa3f..303dda8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@kobalab/majiang-core",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@kobalab/majiang-core",
-      "version": "1.3.0",
+      "version": "1.3.1",
       "license": "MIT",
       "devDependencies": {
         "mocha": "^10.7.3",
diff --git a/package.json b/package.json
index 6d2d664..be409c2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kobalab/majiang-core",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "麻雀基本ライブラリ",
   "publishConfig": {
     "access": "public"
diff --git a/test/board.js b/test/board.js
index c442ddc..488c0c6 100644
--- a/test/board.js
+++ b/test/board.js
@@ -101,6 +101,16 @@ suite('Majiang.Board', ()=>{
                                 assert.equal(board.he.map(he=>he._pai.length)
                                                      .reduce((x,y)=>x+y), 0));
         test('手番が初期化されること', ()=> assert.equal(board.lunban, -1));
+        test('ドラが未確定でも処理できること', ()=>{
+            qipai.baopai = '';
+            board.qipai(qipai);
+            assert.equal(board.shan.baopai.length, 0);
+        });
+        test('ドラが複数でも処理できること', ()=>{
+            qipai.baopai = ['s1','p9'];
+            board.qipai(qipai);
+            assert.deepEqual(board.shan.baopai, qipai.baopai);
+        });
     });
 
     suite('zimo(zimo)', ()=>{