An ote-mon gate is a gate constructed at the most important entrance of a Japanese castle that leads to kuruwa (walls of a castle) such as a ninomaru (second bailey) and a sannomaru (outer part of the castle).
大手門（おおてもん）とは、日本の城郭における内部二の丸または、三の丸などの曲輪へ通じる虎口に設けられた門。