In 1926, the Tokyo Metropolitan Police Board enacted the regulations called Yuenchi-Torishimarikisoku. They were issued for the amusement parks around Tokyo. In the regulations, the police board thought that an amusement park might develop to a facility for sexual pleasure. As a background of this regulations, in the academic magazine of garden design, some informed people wrote articles, in which they maintained that early amusement parks were not founded in sound places and shuold be changed into places for the public benefits. In fact, many amusement parks before the regulations were located near the licensed quarters. This paper clarifies such a social situation concerned with the issue of regulations.