Abstract: A technique to extensively increase the efficiency of the construction of large-size wooden building and to effectively use the loading space when materials for construction are transported fixes a basic hardware on a lateral surface of a longitudinal member with a subsidiary hardware on an end surface of a lateral member. The basic hardware has an upper tapered portion and a lower receiving portion and is affixed to the longitudinal member. The subsidiary hardware is affixed to the lateral member and has a lower tapered portion and an upper receiving portion that engage with the upper tapered portion and the lower receiving portion, respectively, of the basic hardware to join the longitudinal member and the lateral member together.