The objective of this treatise is to study the effect which rock`n`roll had on fashion through the fashion of rock`n`roll stars and contemporary youngsters. The United states of America in the 1950`s when rock`n`roll came into existence was an opulent and luxurious period. People`s spare time increased and teenagers who grew up in oppulence after World War II emlerged. It was rock`n`roll that comprised the background of their culture. Rock`n`roll music, which was in the mixed form of Negro`s rhythm and blues, and country -and-western of Southern hillbilly Rock`n`roll was expressed as a `culture`, characterized by both the luxurious and oppulent culture and the `anti-establishment` defying it. This cultural characteristic emerged as at once the conservative fashion following the contemporary fashion and the anti-establishment fashion in the rock`n`roll fashion. Therefore, the rock`n`roll fashion influenced by popular music became one momentum of including popular music among factors affecting the twentieth-century modern fashion.