Since the establishment of Japan Self Defence Forces (JSDF) on July 1, 1954, its capabilities and size has reached a significant level and influenced greatly on Asia-Pacific security affairs. With the armed forces of general states, JSDF is crucial to the national security, however receives evaluations and expectations from Japanese citizens very differently in comparing with other countries. According to the survey of Cabinet Information Office, this article will analyze JSDF's functions from the perspectives of public opinions, which may be sufficient as a reference in our situation.