diff --git a/src/cocoatweet/api/api.cc b/src/cocoatweet/api/api.cc
index 04ca82d..fedaabf 100644
--- a/src/cocoatweet/api/api.cc
+++ b/src/cocoatweet/api/api.cc
@@ -3,6 +3,7 @@
 namespace CocoaTweet::API {
 API::API(CocoaTweet::OAuth::Key _key) {
   oauth_         = std::make_shared<CocoaTweet::OAuth::OAuth1>(_key);
+  user_          = Users::User(oauth_);
   status_        = Statuses::Status(oauth_);
   favorite_      = Favorites::Favorite(oauth_);
   media_         = Medias::Media(oauth_);
@@ -13,6 +14,10 @@ const std::string& API::generateBearerToken() const {
   return oauth_->generateBearerToken();
 }
 
+Users::User API::user() const {
+  return user_;
+}
+
 Statuses::Status API::status() const {
   return status_;
 }
diff --git a/src/cocoatweet/api/api.h b/src/cocoatweet/api/api.h
index 62ab2ff..4a41b4f 100644
--- a/src/cocoatweet/api/api.h
+++ b/src/cocoatweet/api/api.h
@@ -1,6 +1,7 @@
 #ifndef COCOATWEET_API_API_H_
 #define COCOATWEET_API_API_H_
 
+#include <cocoatweet/api/user/user.h>
 #include <cocoatweet/api/status/status.h>
 #include <cocoatweet/api/favorite/favorite.h>
 #include <cocoatweet/api/media/media.h>
@@ -15,6 +16,8 @@ public:
   /// @param[in] _key Twitter API Key typed CocoaTweet::OAuth::Key
   API(CocoaTweet::OAuth::Key _key);
 
+  Users::User user() const;
+
   /// @brief Getter for Grouped by Statuses/*
   /// @param[out] Status object typed CocoaTweet::API::Statuses::Status
   Statuses::Status status() const;
@@ -29,6 +32,7 @@ public:
   const std::string& generateBearerToken() const;
 
 private:
+  Users::User user_;
   Statuses::Status status_;
   Favorites::Favorite favorite_;
   Medias::Media media_;
diff --git a/src/cocoatweet/api/interface/httpGet.cc b/src/cocoatweet/api/interface/httpGet.cc
index 9699e2c..af5b43e 100644
--- a/src/cocoatweet/api/interface/httpGet.cc
+++ b/src/cocoatweet/api/interface/httpGet.cc
@@ -108,12 +108,14 @@ void HttpGet::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
 #endif
   if ((responseCode / 100) == 4) {
     auto j       = nlohmann::json::parse(rcv);
-    auto error   = j["errors"][0]["code"];
-    auto message = j["errors"][0]["message"];
     if (j.count("error") != 0) {
       // この形式はエラーコードを持たないのでエラー種別が特定できない
       throw new CocoaTweet::Exception::Exception(j["error"]);
     }
+
+    auto error   = j["errors"][0]["code"];
+    auto message = j["errors"][0]["message"];
+    
     if (error.get<int>() == 144) {
       throw CocoaTweet::Exception::TweetNotFoundException(message.get<std::string>().c_str());
     } else if (error.get<int>() == 32) {
diff --git a/src/cocoatweet/api/interface/httpPost.cc b/src/cocoatweet/api/interface/httpPost.cc
index e318245..84f20dc 100644
--- a/src/cocoatweet/api/interface/httpPost.cc
+++ b/src/cocoatweet/api/interface/httpPost.cc
@@ -119,12 +119,13 @@ void HttpPost::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
 #endif
   if ((responseCode / 100) == 4) {
     auto j       = nlohmann::json::parse(rcv);
-    auto error   = j["errors"][0]["code"];
-    auto message = j["errors"][0]["message"];
     if (j.count("error") != 0) {
       // この形式はエラーコードを持たないのでエラー種別が特定できない
       throw new CocoaTweet::Exception::Exception(j["error"]);
     }
+    
+    auto error   = j["errors"][0]["code"];
+    auto message = j["errors"][0]["message"];
     if (error.get<int>() == 144) {
       throw CocoaTweet::Exception::TweetNotFoundException(message.get<std::string>().c_str());
     } else if (error.get<int>() == 32) {
diff --git a/src/cocoatweet/api/model/tweet.cc b/src/cocoatweet/api/model/tweet.cc
index 22f971e..ab978ba 100644
--- a/src/cocoatweet/api/model/tweet.cc
+++ b/src/cocoatweet/api/model/tweet.cc
@@ -10,11 +10,10 @@ Tweet Tweet::parse(const std::string& _json) {
   tweet.createdAt(j["created_at"]);
   tweet.text(j["text"]);
   tweet.source(j["source"]);
-  if(j.contains("user")){
+  if (j.contains("user")) {
     tweet.user(CocoaTweet::API::Model::User(j["user"].dump()));
   }
 
-
   return tweet;
 }
 
diff --git a/src/cocoatweet/api/user/show.cc b/src/cocoatweet/api/user/show.cc
new file mode 100644
index 0000000..eb53776
--- /dev/null
+++ b/src/cocoatweet/api/user/show.cc
@@ -0,0 +1,34 @@
+#include "cocoatweet/api/user/show.h"
+#include <cocoatweet/util/util.h>
+#include "nlohmann/json.hpp"
+
+namespace CocoaTweet::API::Users {
+Show::Show() {
+  contentType_ = "application/x-www-form-urlencoded";
+  url_         = "https://api.twitter.com/1.1/users/show.json";
+}
+
+void Show::screenName(const std::string& _screenName) {
+  if(bodyParam_.count("user_id") > 0){
+    bodyParam_.erase("user_id");
+  }
+  bodyParam_.insert_or_assign("screen_name", _screenName);
+}
+
+void Show::id(const std::string& _id) {
+  if(bodyParam_.count("screen_name") > 0){
+    bodyParam_.erase("screen_name");
+  }
+  bodyParam_.insert_or_assign("id", _id);
+}
+
+CocoaTweet::API::Model::User Show::process(
+    std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth) {
+  CocoaTweet::API::Model::User user;
+  HttpGet::process(_oauth, [&user](const std::string& _rcv) {
+    user = CocoaTweet::API::Model::User::parse(_rcv);
+  });
+  return user;
+}
+
+} // namespace CocoaTweet::API::Statuses
diff --git a/src/cocoatweet/api/user/show.h b/src/cocoatweet/api/user/show.h
new file mode 100644
index 0000000..f8848ee
--- /dev/null
+++ b/src/cocoatweet/api/user/show.h
@@ -0,0 +1,36 @@
+#ifndef COCOATWEET_API_USER_SHOW_H_
+#define COCOATWEET_API_USER_SHOW_H_
+
+#include <cocoatweet/api/interface/httpGet.h>
+#include <cocoatweet/api/model/user.h>
+#include <vector>
+#include <utility>
+#include <memory>
+
+namespace CocoaTweet::API::Users {
+/// @brief class for using users/show endpoint
+class Show : public CocoaTweet::API::Interface::HttpGet {
+public:
+  /// @brief primary constructor
+  Show();
+
+  /// @brief set screen name to get user information
+  /// @param[in] const std::string& _id : screen name for getting information
+  void id(const std::string& _id);
+
+  /// @brief set screen name to get user information
+  /// @param[in] const std::string& _screenName : screen name for getting information
+  void screenName(const std::string& _screenName);
+
+  /// @brief process request for endpoint
+  /// @param[in] std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth : pointer to oauth object
+  /// @param[out] CocoaTweet::API::Model::User : request result
+  CocoaTweet::API::Model::User process(
+      std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth);
+
+private:
+  std::string status_;
+};
+} // namespace CocoaTweet::API::Statuses
+
+#endif
diff --git a/src/cocoatweet/api/user/user.cc b/src/cocoatweet/api/user/user.cc
new file mode 100644
index 0000000..298b3b1
--- /dev/null
+++ b/src/cocoatweet/api/user/user.cc
@@ -0,0 +1,14 @@
+#include <cocoatweet/api/user/user.h>
+#include <cocoatweet/api/user/show.h>
+
+namespace CocoaTweet::API::Users{
+    User::User(std::shared_ptr<CocoaTweet::OAuth::OAuth1> _oauth) {
+  oauth_ = _oauth;
+}
+
+    CocoaTweet::API::Model::User User::show(const std::string& _screenName)const{
+        CocoaTweet::API::Users::Show show;
+        show.screenName(_screenName);
+        return show.process(oauth_);
+    }
+}
\ No newline at end of file
diff --git a/src/cocoatweet/api/user/user.h b/src/cocoatweet/api/user/user.h
new file mode 100644
index 0000000..f6bfea6
--- /dev/null
+++ b/src/cocoatweet/api/user/user.h
@@ -0,0 +1,26 @@
+#ifndef COCOATWEET_API_USER_USER_H_
+#define COCOATWEET_API_USER_USER_H_
+
+#include "cocoatweet/api/interface/groupInterface.h"
+#include "cocoatweet/oauth/oauth.h"
+#include <cocoatweet/api/model/user.h>
+#include <vector>
+#include <utility>
+
+namespace CocoaTweet::API::Users {
+/// @brief class for using users/show endpoint
+class User : public groupInterface {
+public:
+  /// @brief primary constructor
+  User() = default;
+  
+  /// @brief   constructor which finally should to be called.
+  /// @param[in] std::shared_ptr<CocoaTweet::OAuth::OAuth1> : pointer to OAuth object
+  User(std::shared_ptr<CocoaTweet::OAuth::OAuth1> _oauth);
+
+  CocoaTweet::API::Model::User show(const std::string& _screenName) const;
+
+};
+} // namespace CocoaTweet::API::Statuses
+
+#endif
diff --git a/src/cocoatweet/oauth/authorize.cc b/src/cocoatweet/oauth/authorize.cc
new file mode 100644
index 0000000..e69de29
diff --git a/src/cocoatweet/oauth/authorize.h b/src/cocoatweet/oauth/authorize.h
new file mode 100644
index 0000000..e69de29
diff --git a/src/cocoatweet/oauth/oauth2/invalidateToken.cc b/src/cocoatweet/oauth/oauth2/invalidateToken.cc
new file mode 100644
index 0000000..e69de29
diff --git a/src/cocoatweet/oauth/oauth2/invalidateToken.h b/src/cocoatweet/oauth/oauth2/invalidateToken.h
new file mode 100644
index 0000000..e69de29
diff --git a/src/cocoatweet/oauth/oauth2/token.cc b/src/cocoatweet/oauth/oauth2/token.cc
new file mode 100644
index 0000000..e69de29
diff --git a/src/cocoatweet/oauth/oauth2/token.h b/src/cocoatweet/oauth/oauth2/token.h
new file mode 100644
index 0000000..e69de29