It studied the main subject about the historic value of the construction material that was used at the Yokosuka ironworks. Centered on the brick, the cement and the timber as the object of the study. As a result, it was proved that there was a policy that often uses the construction material that is made in Japan. Then, that the French technical expert collected construction material in Japanese each place for this purpose and to have been taking on the investigation study were confirmed. Moreover, it was conscious that it manufactured in the country at the brick from the construction first. As for the timber, the collection and the investigation having to do with science that dealt with the whole country were done. Also, as for the cement, it connected with the manufacturing beginning in Japan. Then, the result was reflected in the display one of the Viennese international exposition. Therefore, it is possible to say that the Yokosuka ironworks played an important role in case of introduction of the western architecture to Japan.
