In many cases, differing from small-scale Yagura, tenshu included a Corridor, Irikawa, which is under the Geya, and inner-side Moya, which is the main space.
天守は、他の小型の櫓と違い、内部に廊下や下屋に当たる入側とその内側の主な空間である母屋を造ることが多い。