This term may already be extinct&sbquo but its translation in Japanese has a significant meaning. It is generally translated as taishu bunka (mass culture) or tsuzoku bunka (common culture). Here&sbquo however&sbquo we must define its association with mass culture and common culture. The English word popular indicates the working class and the middle class. The historical foundation of the word was the working class and its commonality in society. From this context&sbquo a musical genre called pop music was born. We can say that this is the most prominent aspect of pop culture. Among musical genres&sbquo pop music has a distinct history and definition as a music culture. In addition to this definition&sbquo in Japan&sbquo it is possible to define pop culture as the result of mass tastes or preferences and favored trends taking root. In America and Japan in particular&sbquo where the middle class comprises the majority&sbquo after further categorizing mass culture&sbquo commonality in the narrow sense of segmented socialization and micro socialization was once called pop culture. That is&sbquo in structuralism&sbquo mass culture and commonality can be considered as cultural phenomena generated by economic effects. It was isolated from such social movements as the counter culture and underground culture. Moreover&sbquo as the definition of mass culture grew more difficult&sbquo and as class society grew more conspicuous&sbquo a gap was born between commonality and mass culture. In design&sbquo it is clear that modern design in particular has intended to become more sophisticated or raise its tastefulness by both approving&sbquo and at the same time somewhat denying&sbquo commonality. Or rather&sbquo there has been an aspect at the very foundations of design that maneuvers to create fads out of commonality by manipulating counter cultures. I believe Japanese mass culture r common culture today requires re-verification.