Japan's civil society is being transformed as more people volunteer for advocacy and professional nonprofit organizations. In the US context, this trend has been accompanied by a decline in participation in traditional organizations. Does the rise in new types of nonprofit groups herald a decline of traditional volunteering in Japan? This article argues that while changes in civil rights, political opportunity structure, and technology have also taken place in Japan, they have contributed to the rise of new groups without causing traditional organizations to decline, because Japanese attitudes about civic responsibility have continued to support traditional volunteering.