diff --git a/HISTORY.rst b/HISTORY.rst
index c6411e2..411e90b 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -2,6 +2,13 @@
 History
 =======
 
+1.1.1 (2024-10-09)
+-------------------
+
+* Removes hardcodings
+* Adds Configuration Interface
+* Updates the docs
+
 1.1.0 (2024-10-04)
 -------------------
 
diff --git a/MANIFEST.in b/MANIFEST.in
index e59b177..7f80a41 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,6 +3,7 @@
 include HISTORY.rst
 include LICENSE
 include README.rst
+include conf/k2hr3client.ini
 
 recursive-include k2hr3client *
 recursive-exclude * __pycache__
diff --git a/conf/k2hr3client.ini b/conf/k2hr3client.ini
new file mode 100644
index 0000000..00b639f
--- /dev/null
+++ b/conf/k2hr3client.ini
@@ -0,0 +1,19 @@
+[DEFAULT]
+debug = False
+iaas_url = "http://172.24.4.1"
+iaas_project = "demo"
+iaas_user = "demo"
+iaas_password = "password"
+log_file = sys.stdout
+log_dir = logs
+log_level = logging.INFO
+
+[k2hr3]
+api_url = "http://127.0.0.1:18080"
+api_version = "v1"
+
+[http]
+timeout_seconds = 30
+retry_interval_seconds = 60
+max_retries = 3
+allow_self_signed_cert = True
diff --git a/docs/locale/ja/LC_MESSAGES/history.po b/docs/locale/ja/LC_MESSAGES/history.po
index f8e97f4..0f9686e 100644
--- a/docs/locale/ja/LC_MESSAGES/history.po
+++ b/docs/locale/ja/LC_MESSAGES/history.po
@@ -10,7 +10,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: k2hr3client \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-10-04 20:13+0900\n"
+"POT-Creation-Date: 2024-10-09 15:10+0900\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language: ja\n"
@@ -26,62 +26,74 @@ msgid "History"
 msgstr "歴史"
 
 #: ../../../HISTORY.rst:6
-msgid "1.1.0 (2024-10-04)"
+msgid "1.1.1 (2024-10-09)"
 msgstr ""
 
 #: ../../../HISTORY.rst:8
-msgid "Removes the deprecated Interfaces"
-msgstr "非推奨のインタフェースを削除"
+msgid "Removes hardcodings"
+msgstr "ハードコーディングを削除"
 
 #: ../../../HISTORY.rst:9
-msgid "Removes the examples"
-msgstr "例示プログラムの削除"
+msgid "Adds Configuration Interface"
+msgstr "設定用インターフェースを追加"
 
-#: ../../../HISTORY.rst:10
+#: ../../../HISTORY.rst:10 ../../../HISTORY.rst:17
 msgid "Updates the docs"
 msgstr "ドキュメントの更新"
 
 #: ../../../HISTORY.rst:13
-msgid "1.0.3 (2024-10-03)"
+msgid "1.1.0 (2024-10-04)"
 msgstr ""
 
 #: ../../../HISTORY.rst:15
+msgid "Removes the deprecated Interfaces"
+msgstr "非推奨のインタフェースを削除"
+
+#: ../../../HISTORY.rst:16
+msgid "Removes the examples"
+msgstr "例示プログラムの削除"
+
+#: ../../../HISTORY.rst:20
+msgid "1.0.3 (2024-10-03)"
+msgstr ""
+
+#: ../../../HISTORY.rst:22
 msgid "Fixes the K2hr3 API version"
 msgstr "K2hr3 APIのバージョンを固定化"
 
-#: ../../../HISTORY.rst:16
+#: ../../../HISTORY.rst:23
 msgid "Deprecates K2hr3Resource.create_conf_resource params"
 msgstr "K2hr3Resource.create_conf_resourceのパラメータを一部非推奨化"
 
-#: ../../../HISTORY.rst:19
+#: ../../../HISTORY.rst:26
 msgid "1.0.2 (2024-09-26)"
 msgstr ""
 
-#: ../../../HISTORY.rst:21
+#: ../../../HISTORY.rst:28
 msgid "Fixes lint errors"
 msgstr "静的解析ツールのエラーを修正"
 
-#: ../../../HISTORY.rst:24
+#: ../../../HISTORY.rst:31
 msgid "1.0.1 (2024-09-25)"
 msgstr ""
 
-#: ../../../HISTORY.rst:26
+#: ../../../HISTORY.rst:33
 msgid "Fixes resource API bugs"
 msgstr "Resource APIの不具合を修正"
 
-#: ../../../HISTORY.rst:29
+#: ../../../HISTORY.rst:36
 msgid "1.0.0 (2024-08-28)"
 msgstr ""
 
-#: ../../../HISTORY.rst:31
+#: ../../../HISTORY.rst:38
 msgid "Supports the other APIs"
 msgstr "他のAPIをサポート"
 
-#: ../../../HISTORY.rst:34
+#: ../../../HISTORY.rst:41
 msgid "0.0.1 (2020-08-28)"
 msgstr ""
 
-#: ../../../HISTORY.rst:36
+#: ../../../HISTORY.rst:43
 msgid "Supports Token, Resource, Policy and Role API"
 msgstr "トークン、リソース、ポリシーおよびロールAPIをサポート"
 
diff --git a/src/k2hr3client/__init__.py b/src/k2hr3client/__init__.py
index 7e0144a..5bac0ad 100644
--- a/src/k2hr3client/__init__.py
+++ b/src/k2hr3client/__init__.py
@@ -22,8 +22,10 @@
 """K2HR3 Python Client of Token API."""
 
 __author__ = 'Hirotaka Wakabayashi <hiwakaba@lycorp.co.jp>'
-__version__ = '1.1.0'
+__version__ = '1.1.1'
 
+import configparser
+from pathlib import Path
 import sys
 
 if sys.platform.startswith('win'):
@@ -39,6 +41,65 @@ def get_version() -> str:
     return __version__
 
 
+# 1. Defines the default config as a package level variable.
+CONFIG = configparser.ConfigParser()
+# [DEFAULT]
+# debug = False
+# iaas_url = http://172.24.4.1
+# iaas_project = demo
+# iaas_user = demo
+# iaas_password = password
+# log_file = sys.stdout
+# log_dir = logs
+# log_format = %(asctime)-15s %(levelname)s %(name)s %(message)s
+# log_level = logging.INFO
+default_section = CONFIG['DEFAULT']
+default_section['debug'] = "False"
+default_section['iaas_url'] = "http://172.24.4.1"
+default_section['iaas_project'] = "demo"
+default_section['iaas_user'] = "demo"
+default_section['iaas_password'] = "password"
+default_section['log_file'] = "sys.stderr"
+default_section['log_dir'] = "logs"
+default_section['log_level'] = "logging.INFO"
+
+# [k2hr3]
+# api_url = "http://127.0.0.1:18080"
+# api_version = "v1"
+CONFIG['k2hr3'] = {}
+k2hr3_section = CONFIG['k2hr3']
+k2hr3_section['api_url'] = "http://127.0.0.1:18080"
+k2hr3_section['api_version'] = "v1"
+
+# [http]
+# timeout_seconds = 30
+# retry_interval_seconds = 60
+# max_retries = 3
+# allow_self_signed_cert = True
+CONFIG['http'] = {}
+http_section = CONFIG['http']
+http_section['timeout_seconds'] = "30"
+http_section['retry_interval_seconds'] = "60"
+http_section['max_retries'] = "3"
+http_section['allow_self_signed_cert'] = "True"
+
+# 2. Overrides the default config by the config file.
+# Find the config using precedence of the location:
+#   ./k2hr3client.ini
+#   ~/.k2hr3client.ini
+#   /etc/antpickax/k2hr3client.ini
+# NOTE:
+# Using the configuration value may occur KeyError.
+# All values are string. Use getboolean or something.
+config_path = [Path("k2hr3client.ini"),
+               Path(Path.home() / '.k2hr3client.ini'),
+               Path('/etc/antpickax/k2hr3client.ini')]
+for my_config in config_path:
+    if my_config.is_file():
+        # Override the value if the key is defined.
+        CONFIG.read(my_config.absolute())
+        break
+
 #
 # Local variables:
 # tab-width: 4
diff --git a/src/k2hr3client/http.py b/src/k2hr3client/http.py
index cfbaf86..0bab18a 100644
--- a/src/k2hr3client/http.py
+++ b/src/k2hr3client/http.py
@@ -51,6 +51,7 @@
 
 from k2hr3client.api import K2hr3HTTPMethod, K2hr3Api
 from k2hr3client.exception import K2hr3Exception
+from k2hr3client import CONFIG
 
 LOG = logging.getLogger(__name__)
 
@@ -75,12 +76,12 @@ class K2hr3Http():  # pylint: disable=too-many-instance-attributes
     def __init__(self, baseurl: str) -> None:
         """Init the members."""
         self._set_baseurl(baseurl)
-        self._timeout_seconds = 30
+        self._timeout_seconds = CONFIG['http'].getint('timeout_seconds')
         self._url = None  # type: Optional[str]
         self._urlparams = None  # type: Optional[str]
-        self._retry_interval_seconds = 60  # type: int
-        self._retries = 3  # type: int
-        self._allow_self_signed_cert = True  # type: bool
+        self._retry_interval_seconds = CONFIG['http'].getint('retry_interval_seconds')  # noqa
+        self._retries = CONFIG['http'].getint('retries')
+        self._allow_self_signed_cert = CONFIG['http'].getboolean('allow_self_signed_cert')  # noqa
 
     def __repr__(self) -> str:
         """Represent the members."""