It was constructed, in many cases, in the shapes like Boro put on top of the Hira-Yagura turret of Irimoya-zukuri and Boro put on top of Niju Yagura of Jubako-zukuri on the Irimoya roof.
主に、入母屋造の平櫓の上に望楼を載せたようなものや、入母屋屋根の重箱造りの二重櫓に望楼を載せたような形にすることが多い。