Where to find camping information

The National Camping Association of Japan website is in Japanese and in  English

Japan National Tourist Orginization’s List  in Japan (PDF file) lists camping grounds in the most well known tourist areas such as Nikko, Karuizawa, Hakone, Okutama, Kamikochi, Nagiso, Sado Is., Kawaguchi-ko, Takayama, Kawayu, Himeji, and Miyajima. It gives you an idea of the wide variety of services, prices, and open-seasons. Being a JNTO listing, they tend to be more reputable and less run-down than you might find via a Google search of Camping Places

Will Ferguson’s  “The Hitchhiker’s Guide to Japan“ (Chas. Tutle, 1998, ISBN #0804820686) is a very good resource for anyone planning to travel on a budget, or go camping or hitch-hiking in Japan. It is half cheap travel tips and half route and destination information for Hokkaido, Tohoku, Shikoku, and Kyushu. It may be somewhat dated though.