The Kenchikushi Law for Architects & Building Engineers was completed by reform act in 1951. Purpose of this study is to clarify the reform process of Article 3 of the Law: Types of buildings which require Kenchikushi's design or superintendence. Conclusion of this study is as follows: 1. By reform act of the Law in 1951, Types of buildings were broadened than those of Kakuei Tanaka's declaration in 1950, but most of the housing in need were exempted from the Law. Ryoichi Naito, then the Director of Building Administration Division, Ministry of Construction, supposed every building should be designed or superintended by Kenchikushi. Naito's hope wasn't realized. 2. The first qualification standard of Kenchikushi, being considered simultaneously, was affected by the limitation of the Law. 3. The decision on the limitation imposed a serious problem on building administration officials of regional governments. Therefore, they began to expect the system of architectural agent for procedures required by laws to replace the role of architectural engineer outside the limit.