diff --git a/src/main/scala/gitbucket/core/api/ApiPullRequest.scala b/src/main/scala/gitbucket/core/api/ApiPullRequest.scala
index 8efa944..0e21596 100644
--- a/src/main/scala/gitbucket/core/api/ApiPullRequest.scala
+++ b/src/main/scala/gitbucket/core/api/ApiPullRequest.scala
@@ -17,6 +17,7 @@
   mergeable: Option[Boolean],
   merged: Boolean,
   merged_at: Option[Date],
+  merged_by: Option[ApiUser],
   title: String,
   body: String,
   user: ApiUser) {
@@ -34,22 +35,27 @@
 
 object ApiPullRequest{
   def apply(issue: Issue, pullRequest: PullRequest, headRepo: ApiRepository, baseRepo: ApiRepository, user: ApiUser,
-            /*mergeable: Boolean,*/ merged: Boolean, mergedAt: Option[Date]): ApiPullRequest =
+            /*mergeable: Boolean,*/ merged: Boolean, mergedAt: Option[Date], mergedBy: Option[ApiUser]): ApiPullRequest =
     ApiPullRequest(
       number     = issue.issueId,
       updated_at = issue.updatedDate,
       created_at = issue.registeredDate,
       head       = Commit(
-                     sha  = pullRequest.commitIdTo,
-                     ref  = pullRequest.requestBranch,
-                     repo = headRepo)(issue.userName),
+        sha       = pullRequest.commitIdTo,
+        ref       = pullRequest.requestBranch,
+        repo      = headRepo,
+        baseOwner = issue.userName
+      ),
       base       = Commit(
-                     sha  = pullRequest.commitIdFrom,
-                     ref  = pullRequest.branch,
-                     repo = baseRepo)(issue.userName),
+        sha       = pullRequest.commitIdFrom,
+        ref       = pullRequest.branch,
+        repo      = baseRepo,
+        baseOwner = issue.userName
+      ),
       mergeable  = None, // TODO: need check mergeable.
       merged     = merged,
       merged_at  = mergedAt,
+      merged_by  = mergedBy,
       title      = issue.title,
       body       = issue.content.getOrElse(""),
       user       = user
@@ -58,7 +64,8 @@
   case class Commit(
     sha: String,
     ref: String,
-    repo: ApiRepository)(baseOwner:String){
+    repo: ApiRepository,
+    baseOwner:String){
     val label = if( baseOwner == repo.owner.login ){ ref }else{ s"${repo.owner.login}:${ref}" }
     val user = repo.owner
   }
diff --git a/src/main/scala/gitbucket/core/controller/ApiController.scala b/src/main/scala/gitbucket/core/controller/ApiController.scala
index 918bf9c..1364526 100644
--- a/src/main/scala/gitbucket/core/controller/ApiController.scala
+++ b/src/main/scala/gitbucket/core/controller/ApiController.scala
@@ -407,7 +407,7 @@
 
 
     JsonFormat(issues.map { case (issue, issueUser, commentCount, pullRequest, headRepo, headOwner) =>
-      val comments = getCommentsForApi(repository.owner, repository.name, issue.issueId)
+      val mergedComment = getMergedComment(getCommentsForApi(repository.owner, repository.name, issue.issueId))
 
       ApiPullRequest(
         issue       = issue,
@@ -415,8 +415,9 @@
         headRepo    = ApiRepository(headRepo, ApiUser(headOwner)),
         baseRepo    = ApiRepository(repository, ApiUser(baseOwner)),
         user        = ApiUser(issueUser),
-        merged      = comments.exists { case (comment, _, _) => comment.action == "merged" },
-        mergedAt    = comments.collectFirst { case (comment, _, _) if(comment.action == "merged") => comment.registeredDate }
+        merged      = mergedComment.isDefined,
+        mergedAt    = mergedComment.map { case (comment, _) => comment.registeredDate },
+        mergedBy    = mergedComment.map { case (_, account) => ApiUser(account) }
       )
     })
   })
@@ -434,7 +435,7 @@
       issueUser <- users.get(issue.openedUserName)
       headRepo  <- getRepository(pullRequest.requestUserName, pullRequest.requestRepositoryName)
     } yield {
-      val comments = getCommentsForApi(repository.owner, repository.name, issueId)
+      val mergedComment = getMergedComment(getCommentsForApi(repository.owner, repository.name, issue.issueId))
 
       JsonFormat(ApiPullRequest(
         issue       = issue,
@@ -442,8 +443,9 @@
         headRepo    = ApiRepository(headRepo, ApiUser(headOwner)),
         baseRepo    = ApiRepository(repository, ApiUser(baseOwner)),
         user        = ApiUser(issueUser),
-        merged      = comments.exists { case (comment, _, _) => comment.action == "merged" },
-        mergedAt    = comments.collectFirst { case (comment, _, _) if(comment.action == "merged") => comment.registeredDate }
+        merged      = mergedComment.isDefined,
+        mergedAt    = mergedComment.map { case (comment, _) => comment.registeredDate },
+        mergedBy    = mergedComment.map { case (_, account) => ApiUser(account) }
       ))
     }) getOrElse NotFound()
   })
diff --git a/src/main/scala/gitbucket/core/service/IssuesService.scala b/src/main/scala/gitbucket/core/service/IssuesService.scala
index c050e79..29eb86f 100644
--- a/src/main/scala/gitbucket/core/service/IssuesService.scala
+++ b/src/main/scala/gitbucket/core/service/IssuesService.scala
@@ -34,6 +34,10 @@
     .map{ case ((t1, t2), t3) => (t1, t2, t3) }
     .list
 
+  def getMergedComment(comments: List[(IssueComment, Account, Issue)]): Option[(IssueComment, Account)] = {
+    comments.collectFirst { case (comment, account, _) if comment.action == "merged" => (comment, account) }
+  }
+
   def getComment(owner: String, repository: String, commentId: String)(implicit s: Session) =
     if (commentId forall (_.isDigit))
       IssueComments filter { t =>
diff --git a/src/main/scala/gitbucket/core/service/WebHookService.scala b/src/main/scala/gitbucket/core/service/WebHookService.scala
index 86ba402..4d9e516 100644
--- a/src/main/scala/gitbucket/core/service/WebHookService.scala
+++ b/src/main/scala/gitbucket/core/service/WebHookService.scala
@@ -192,7 +192,7 @@
         issueUser <- users.get(issue.openedUserName)
         headRepo  <- getRepository(pullRequest.requestUserName, pullRequest.requestRepositoryName)
       } yield {
-        val comments = getCommentsForApi(repository.owner, repository.name, issueId)
+        val mergedComment = getMergedComment(getCommentsForApi(repository.owner, repository.name, issueId))
 
         WebHookPullRequestPayload(
           action         = action,
@@ -204,8 +204,9 @@
           baseRepository = repository,
           baseOwner      = baseOwner,
           sender         = sender,
-          merged         = comments.exists { case (comment, _, _) => comment.action == "merged" },
-          mergedAt       = comments.collectFirst { case (comment, _, _) if(comment.action == "merged") => comment.registeredDate }
+          merged         = mergedComment.isDefined,
+          mergedAt       = mergedComment.map { case (comment, _) => comment.registeredDate },
+          mergedBy       = mergedComment.map { case (_, account) => ApiUser(account) }
         )
       }
     }
@@ -236,7 +237,7 @@
       ((issue, issueUser, pullRequest, baseOwner, headOwner), webHooks) <- getPullRequestsByRequestForWebhook(requestRepository.owner, requestRepository.name, requestBranch)
       baseRepo <- getRepository(pullRequest.userName, pullRequest.repositoryName)
     } yield {
-      val comments = getCommentsForApi(baseRepo.owner, baseRepo.name, issue.issueId)
+      val mergedComment = getMergedComment(getCommentsForApi(baseRepo.owner, baseRepo.name, issue.issueId))
 
       val payload = WebHookPullRequestPayload(
         action         = action,
@@ -248,8 +249,9 @@
         baseRepository = baseRepo,
         baseOwner      = baseOwner,
         sender         = sender,
-        merged         = comments.exists { case (comment, _, _) => comment.action == "merged" },
-        mergedAt       = comments.collectFirst { case (comment, _, _) if(comment.action == "merged") => comment.registeredDate }
+        merged         = mergedComment.isDefined,
+        mergedAt       = mergedComment.map { case (comment, _) => comment.registeredDate },
+        mergedBy       = mergedComment.map { case (_, account) => ApiUser(account) }
       )
 
       callWebHook(WebHook.PullRequest, webHooks, payload)
@@ -271,7 +273,7 @@
         issueUser <- users.get(issue.openedUserName)
         headRepo  <- getRepository(pullRequest.requestUserName, pullRequest.requestRepositoryName)
       } yield {
-        val comments = getCommentsForApi(repository.owner, repository.name, issue.issueId)
+        val mergedComment = getMergedComment(getCommentsForApi(repository.owner, repository.name, issue.issueId))
 
         WebHookPullRequestReviewCommentPayload(
           action         = action,
@@ -284,8 +286,9 @@
           baseRepository = repository,
           baseOwner      = baseOwner,
           sender         = sender,
-          merged         = comments.exists { case (comment, _, _) => comment.action == "merged" },
-          mergedAt       = comments.collectFirst { case (comment, _, _) if(comment.action == "merged") => comment.registeredDate }
+          merged         = mergedComment.isDefined,
+          mergedAt       = mergedComment.map { case (comment, _) => comment.registeredDate },
+          mergedBy       = mergedComment.map { case (_, account) => ApiUser(account) }
         )
       }
     }
@@ -386,11 +389,22 @@
         baseOwner: Account,
         sender: Account,
         merged: Boolean,
-        mergedAt: Option[Date]): WebHookPullRequestPayload = {
+        mergedAt: Option[Date],
+        mergedBy: Option[ApiUser]): WebHookPullRequestPayload = {
+
       val headRepoPayload = ApiRepository(headRepository, headOwner)
       val baseRepoPayload = ApiRepository(baseRepository, baseOwner)
       val senderPayload = ApiUser(sender)
-      val pr = ApiPullRequest(issue, pullRequest, headRepoPayload, baseRepoPayload, ApiUser(issueUser), merged, mergedAt)
+      val pr = ApiPullRequest(
+        issue       = issue,
+        pullRequest = pullRequest,
+        headRepo    = headRepoPayload,
+        baseRepo    = baseRepoPayload,
+        user        = ApiUser(issueUser),
+        merged      = merged,
+        mergedAt    = mergedAt,
+        mergedBy    = mergedBy
+      )
 
       WebHookPullRequestPayload(
         action       = action,
@@ -450,7 +464,8 @@
       baseOwner: Account,
       sender: Account,
       merged: Boolean,
-      mergedAt: Option[Date]
+      mergedAt: Option[Date],
+      mergedBy: Option[ApiUser]
     ) : WebHookPullRequestReviewCommentPayload = {
       val headRepoPayload = ApiRepository(headRepository, headOwner)
       val baseRepoPayload = ApiRepository(baseRepository, baseOwner)
@@ -471,7 +486,8 @@
           baseRepo       = baseRepoPayload,
           user           = ApiUser(issueUser),
           merged         = merged,
-          mergedAt       = mergedAt
+          mergedAt       = mergedAt,
+          mergedBy       = mergedBy
         ),
         repository   = baseRepoPayload,
         sender       = senderPayload)