Only 10 - 20 % of total purchases made in Japan are on credit card according to interview

"Between 10 percent and 20 percent [of total purchases] in Japan are made by credit card, which is lower than in Europe and the United States, where the figure is between 20 percent and 30 percent,"

Takao Kawanishi




Source: JCB boss says greater focus on Asia markets in cards
The Yomiuri Shimbun
Jul. 28, 2010
http://www.yomiuri.co.jp/dy/business/T100727003784.htm