Abstract
This article examined the building used the Japanese nail and the Western nail together, and following points became clear.
The combination of the Japanese nail and the Western nail began in the advanced area early in the Meiji era and concentrated on it generally in the latter half from the Meiji early 10s.
There was a dual circulation period for the switch of the Western nail from the Japanese nail, and every use point was gradually rearranged from the Japanese nail to the Western nail.