It is a simplified type of the structure of the Yakui-mon gate (a gate architecture) with a large roof supported by Kagamibashira (main front pillars) and Hikaebashira (rear support pillars), for which ingenuity was exercised in reducing blind spots for defense by making the roof smaller.
鏡柱と控柱を一つの大きな屋根に収める構造の薬医門を簡略化したもので、屋根を小ぶりにして守備側の死角を減らす工夫が施された。