The purpose of this study is to examine the activity of architectural publisher KOYOSHA (1912-1944) from the characteristic of the publication and the persons involved with and is to locate its achievement within the framework of the history of modern architecture in Japan.As the result, below mentioned three points become clear;
1. Its activity is distinguished into three periods.
2. Those change is caused by relationship among the publisher and the authors.
3. Such process also indicates a role of architectural books, in response not only to theoretical promotion of the modernist architecture but also to social needs.
