An extensive and profound system can be abstracted from Laozi, in which there are no more than 5000 characters. However, Laozi addresses many subjects, including nature, society, politics, economics, and culture. Laozi has been studied since it was published, and this study mainly paid attention to the spread of Ho-shang Kun’s version before the Edo Period. A great number of types of manuscripts, which are based on the version of Laozi printed during the Tang Dynasty in China, exist in modern Japan, one of which is in the Umezawa collection that we discuss. This paper discusses the expansion and acceptance of Laozi in Japan from the study of Kun-yomi in the Umezawa collection.