unicorn使用時nginxでパーミッションエラー

unicorn+nginxで動かそうとしてcapistranoでデプロイしたら『403 forbidden』のエラーがでました。
ログをみてみると、

2015/09/23 03:00:12 [crit] 1140#0: *1 stat() "/home/app/appname/production/current/public/" failed (13: Permission denied), client: 126.11.111.111, server: sample.com, request: "GET / HTTP/1.1", host: "sample.com"
2015/09/23 03:00:12 [crit] 1140#0: *1 stat() "/home/app/appname/production/current/public/.html" failed (13: Permission denied), client: 126.11.111.111, server: sample.com, request: "GET / HTTP/1.1", host: "sample.com"
2015/09/23 03:00:12 [crit] 1140#0: *1 stat() "/home/app/appname/production/current/public//index.html" failed (13: Permission denied), client: 126.11.111.111, server: sample.com, request: "GET / HTTP/1.1", host: "sample.com"
2015/09/23 03:00:12 [crit] 1140#0: *1 connect() to unix:/home/app/appname/production/current/tmp/sockets/unicorn.sock failed (13: Permission denied) while connecting to upstream, client: 126.11.111.111, server: sample.com, request: "GET / HTTP/1.1", upstream: "http://unix:/home/app/appname/production/current/tmp/sockets/unicorn.sock:/", host: "sample.com"

アプリケーションディレクトリの上のディレクトリのOtherに実行権限が必要でした。

chmod o+x /home/app