This paper explores the development of common sense knowledge about stuttering correction. IZAWA Shuji (1851-1917) established the Rakuseki-Sha, one of the original organizations for stuttering correction in Japan. He was an advocator of “Japanese” education in the colonial government. His work on speech correction in Japan was a continuation of his research on “Japanese” education for language integration. His stuttering correction was not, however, a continuation of his “Japanese” education but was instead practice based on the scientific method (“Shiwa-Hou”). This paper shows that his speech correction was the application of practical ‘Knowledge’ about normal speech.