diff --git a/annofabapi/exceptions.py b/annofabapi/exceptions.py
index 9a510417..d75e23fd 100644
--- a/annofabapi/exceptions.py
+++ b/annofabapi/exceptions.py
@@ -13,6 +13,12 @@ class AnnofabApiException(Exception):
     """
 
 
+class CredentialsNotFoundError(AnnofabApiException):
+    """
+    Annofabの認証情報が見つからないときのエラー
+    """
+
+
 class AnnotationOuterFileNotFoundError(AnnofabApiException):
     """
     アノテーション情報の外部ファイル（塗りつぶしの画像ファイルなど）が、存在しない場合のエラー
diff --git a/annofabapi/resource.py b/annofabapi/resource.py
index a145c736..902a0835 100644
--- a/annofabapi/resource.py
+++ b/annofabapi/resource.py
@@ -6,7 +6,7 @@
 
 from annofabapi import AnnofabApi, AnnofabApi2, Wrapper
 from annofabapi.api import DEFAULT_ENDPOINT_URL
-from annofabapi.exceptions import AnnofabApiException
+from annofabapi.exceptions import CredentialsNotFoundError
 
 logger = logging.getLogger(__name__)
 
@@ -63,18 +63,13 @@ def build(
     elif login_user_id is None and login_password is None:
         try:
             return build_from_env(endpoint_url)
-        except AnnofabApiException:
-            pass
-
-        try:
-            return build_from_netrc(endpoint_url)
-        except AnnofabApiException:
-            pass
-
-        raise AnnofabApiException("環境変数または`.netrc`ファイルにAnnofab認証情報はありませんでした。")
-
+        except CredentialsNotFoundError:
+            try:
+                return build_from_netrc(endpoint_url)
+            except CredentialsNotFoundError as e:
+                raise CredentialsNotFoundError("環境変数または`.netrc`ファイルにAnnofab認証情報はありませんでした。") from e
     else:
-        raise ValueError()
+        raise ValueError("引数`login_user_id`か`login_password`のどちらか一方がNoneです。両方Noneでないか、両方Noneである必要があります。")
 
 
 def build_from_netrc(endpoint_url: str = DEFAULT_ENDPOINT_URL) -> Resource:
@@ -87,22 +82,25 @@ def build_from_netrc(endpoint_url: str = DEFAULT_ENDPOINT_URL) -> Resource:
     Returns:
         annofabapi.Resourceインスタンス
 
+    Raises:
+        CredentialsNotFoundError: `.netrc`ファイルにAnnofabの認証情報がなかった
+
     """
     try:
         netrc_hosts = netrc.netrc().hosts
     except FileNotFoundError as e:
-        raise AnnofabApiException(e) from e
+        raise CredentialsNotFoundError("`.netrc`ファイルは見つかりません。") from e
 
     annofab_hostname = (urlparse(endpoint_url)).hostname
 
     if annofab_hostname not in netrc_hosts:
-        raise AnnofabApiException(f"The `.netrc` file does not contain the machine name '{annofab_hostname}'")
+        raise CredentialsNotFoundError(f"The `.netrc` file does not contain the machine name '{annofab_hostname}'")
 
     host = netrc_hosts[annofab_hostname]
     login_user_id = host[0]
     login_password = host[2]
     if login_user_id is None or login_password is None:
-        raise AnnofabApiException("User ID or password in the .netrc file are None.")
+        raise CredentialsNotFoundError("User ID or password in the .netrc file are None.")
 
     return Resource(login_user_id, login_password, endpoint_url=endpoint_url)
 
@@ -117,10 +115,12 @@ def build_from_env(endpoint_url: str = DEFAULT_ENDPOINT_URL) -> Resource:
     Returns:
         annofabapi.Resourceインスタンス
 
+    Raises:
+        CredentialsNotFoundError: 環境変数にAnnofabの認証情報がなかった
     """
     login_user_id = os.environ.get("ANNOFAB_USER_ID")
     login_password = os.environ.get("ANNOFAB_PASSWORD")
     if login_user_id is None or login_password is None:
-        raise AnnofabApiException("`ANNOFAB_USER_ID` or `ANNOFAB_PASSWORD`  environment variable are empty.")
+        raise CredentialsNotFoundError("`ANNOFAB_USER_ID` or `ANNOFAB_PASSWORD`  environment variable are empty.")
 
     return Resource(login_user_id, login_password, endpoint_url=endpoint_url)
diff --git a/tests/test_local_resource.py b/tests/test_local_resource.py
index c64f6be7..945866fd 100644
--- a/tests/test_local_resource.py
+++ b/tests/test_local_resource.py
@@ -21,8 +21,8 @@ def test_raise_ValueError(self):
         with pytest.raises(ValueError):
             annofabapi.AnnofabApi("test_user", "")
 
-    def test_build_from_env_raise_AnnofabApiException(self):
-        with pytest.raises(annofabapi.exceptions.AnnofabApiException):
+    def test_build_from_env_raise_CredentialsNotFoundError(self):
+        with pytest.raises(annofabapi.exceptions.CredentialsNotFoundError):
             os.environ.pop("ANNOFAB_USER_ID", None)
             os.environ.pop("ANNOFAB_PASSWORD", None)
             build_from_env()
@@ -33,9 +33,17 @@ def test_build_from_env(self):
         assert isinstance(build_from_env(), annofabapi.Resource)
 
     def test_build(self):
+        assert isinstance(build(login_user_id="FOO", login_password="BAR"), annofabapi.Resource)
+
+        with pytest.raises(ValueError):
+            build(login_user_id="FOO", login_password=None)
+
+        with pytest.raises(ValueError):
+            build(login_user_id=None, login_password="BAR")
+
         os.environ["ANNOFAB_USER_ID"] = "FOO"
         os.environ["ANNOFAB_PASSWORD"] = "BAR"
-        assert isinstance(build(), annofabapi.Resource)
+        assert isinstance(build(login_user_id=None, login_password=None), annofabapi.Resource)
 
     def test_build_with_endpoint(self):
         user_id = "test_user"