diff --git a/makeVersionTag.pl b/makeVersionTag.pl
new file mode 100644
index 00000000..f80a8951
--- /dev/null
+++ b/makeVersionTag.pl
@@ -0,0 +1,60 @@
+#!/usr/bin/perl --
+use strict;
+use warnings;
+
+sub cmd($){
+	print "+ ",$_[0],"\n";
+	my $rv=system $_[0];
+	if ($? == -1) {
+        die "failed to execute: $!\n";
+    }elsif ($? & 127) {
+        die "child died with signal %d, %s coredump\n", ($? & 127), ($? & 128) ? 'with' : 'without';
+    }else {
+		my $rv = $? >> 8;
+		$rv and die "child exited with value $rv\n";
+    }
+}
+
+my $buildFile = 'app/build.gradle';
+
+# ワーキングツリーに変更がないことを確認
+open(my $fh,"-|","git status --porcelain --branch")
+	or die "can't check git status. $!";
+
+my @untrackedFiles;
+while(<$fh>){
+	chomp;
+	if(/^\?\?\s*(\S+)/){
+		my $path =$1;
+		next if $path =~ /\.idea|_Emoji|makeVersionTag.pl/;
+		push @untrackedFiles,$path
+	}elsif( /^##\s*(\S+?)(?:\.\.|$)/ ){
+		my $branch=$1;
+		print "# branch=$branch\n";
+		$branch eq 'master'
+			or die "current branch is not master.\n";
+	}else{
+		warn "working tree is not clean.\n";
+		cmd "git status";
+		exit 1;
+	}
+}
+
+close($fh)
+	or die "can't check git status. $!";
+
+@untrackedFiles and die "forgot git add?\n",map{ "- $_\n"} @untrackedFiles;
+
+# 現在のバージョン番号を取得
+`cat $buildFile` =~ /versionName\s+["']([\d\.]+)["']/ 
+	or die "missing versionName in $buildFile\n";
+my($tag)="v$1";
+print "# version=$tag\n";
+
+# すでにタグがあるなら何もしない
+if( not `git tag -l $tag` =~ /$tag/ ){
+	cmd "git tag -a $tag -m $tag";
+}
+
+cmd "git push";
+cmd "git push --tags";