From the characteristic of the kaisho building itself, the origin is said to be the Kakutei (lodging) (Idei (guest room or the bedroom of the owner)), where the guest and master of the house met within the shinden zukuri (architecture representative of a residence of a nobleman in the Heian period).
まず会所の建物そのものの性格からいえば、平安時代、寝殿造りの建築にあった来客と主人が対面するところ、客亭（出居）が、その起源にあげられる。