This study elucidates the production of educational musical instruments and methods of quality assurance of these musical instruments in the postwar era by focusing on the trends of respective government offices of the Ministry of Education, Ministry of Commerce and Industry (reorganized as the Ministry of International Trade and Industry in 1949), Ministry of Finance, and musical instrument industry. After World War II, when nationwide musical instrument education was introduced, the Ministry of Education and musical instrument industry appealed to the Ministry of Commerce and Industry to secure materials for musical instruments and obtained tax exemption from the Ministry of Finance. As musical instruments gained popularity as “educational tools,” the musical instrument industry, which was suffering from material shortage after the war, could revitalize and develop. Furthermore, to assure the quality of educational instruments, the Ministry of Education established product standards and promoted the standardization of parts. Because of this standardization, mass production of inexpensive but quality-maintained instruments became possible. From the first announcement of the enforcement policy on postwar musical instrument education, the musical instrument industry developed through various government policies and brought abundant physical environments to our country's music education field.