diff --git a/src/cocoatweet/api/interface/httpBase.h b/src/cocoatweet/api/interface/httpBase.h
index b52ce83..b5dffc7 100644
--- a/src/cocoatweet/api/interface/httpBase.h
+++ b/src/cocoatweet/api/interface/httpBase.h
@@ -12,13 +12,14 @@ protected:
   std::map<std::string, std::string> bodyParam_;
   std::string url_;
   std::string contentType_;
-  virtual void process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
-               std::function<void(const unsigned int, const std::string&)> _callback) = 0;
-  static size_t curlCallback_(char* _ptr, size_t _size, size_t _nmemb, std::string* _stream){
+  virtual void process(
+      std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
+      std::function<void(const unsigned int, const std::string&)> _callback) = 0;
+  static size_t curlCallback_(char* _ptr, size_t _size, size_t _nmemb, std::string* _stream) {
     int realsize = _size * _nmemb;
     _stream->append(_ptr, realsize);
     return realsize;
-    }
+  }
 };
 } // namespace CocoaTweet::API::Interface
 
diff --git a/src/cocoatweet/api/interface/httpPost.cc b/src/cocoatweet/api/interface/httpPost.cc
index 7a1d208..187b2cb 100644
--- a/src/cocoatweet/api/interface/httpPost.cc
+++ b/src/cocoatweet/api/interface/httpPost.cc
@@ -34,11 +34,20 @@ void HttpPost::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
   // リクエストボディの構築
   std::string requestBody = "";
   {
-    std::vector<std::string> tmp;
-    for (const auto& [key, value] : bodyParam_) {
-      tmp.push_back(key + "=" + CocoaTweet::Util::urlEncode(value));
+    if (contentType_ == "application/x-www-form-urlencoded") {
+      std::vector<std::string> tmp;
+      for (const auto& [key, value] : bodyParam_) {
+        tmp.push_back(key + "=" + CocoaTweet::Util::urlEncode(value));
+        requestBody = CocoaTweet::Util::join(tmp, "&");
+      }
+    } else if (contentType_ == "multipart/form-data") {
+      for (const auto& [key, value] : bodyParam_) {
+        requestBody += (std::string("--") + "milkcocoa0902" + "\r\n");
+        requestBody +=
+            ("Content-Disposition: form-data; name=\"" + key + "\";\r\n\r\n" + value + "\r\n");
+      }
+      requestBody += (std::string("--") + "milkcocoa0902" + "--" + "\r\n");
     }
-    requestBody = CocoaTweet::Util::join(tmp, "&");
   }
 
   // ヘッダの構築
@@ -67,14 +76,22 @@ void HttpPost::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curlCallback_);
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, (std::string*)&rcv);
 #ifndef NDEBUG
-std::cout << "requestBody : " << requestBody << std::endl;
+    std::cout << "requestBody : " << requestBody << std::endl;
     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 #endif
     // Headerを保持するcurl_slist*を初期化
     struct curl_slist* headers = NULL;
     // Authorizationをヘッダに追加
     headers = curl_slist_append(headers, oauthHeader.c_str());
-    headers = curl_slist_append(headers, ("Content-Type: " + contentType_).c_str());
+
+    std::string contentType = "";
+    if (contentType_ == "application/x-www-form-urlencoded") {
+      contentType = contentType_;
+    } else if (contentType_ == "multipart/form-data") {
+      contentType = contentType_ + "; boundary=milkcocoa0902";
+    }
+
+    headers = curl_slist_append(headers, ("Content-Type: " + contentType).c_str());
     curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
     res = curl_easy_perform(curl);
     curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &responseCode);
diff --git a/src/cocoatweet/api/interface/httpPost.h b/src/cocoatweet/api/interface/httpPost.h
index d38fcd3..e4768e7 100644
--- a/src/cocoatweet/api/interface/httpPost.h
+++ b/src/cocoatweet/api/interface/httpPost.h
@@ -6,7 +6,7 @@
 #include <cocoatweet/api/interface/httpBase.h>
 
 namespace CocoaTweet::API::Interface {
-class HttpPost : public HttpBase{
+class HttpPost : public HttpBase {
 public:
 protected:
   void process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,