The Kuroshoin located in the depth of Shiroshoin, which is a room used to meet guests, and in the main room, ichi no ma, there is a toko of one and half ken wide and menkawabashira as a pillar of toko.
黒書院は、対面所である白書院の奥に位置し、主室の一の間には正面右手に一間半の床を設け、床柱には面皮柱を使っている。