Consult Monash Japanese Studies Library Guide for more information about how to find Japanese materials. Here are some websites which might be useful in finding government publications.
The official website of the Japanese Government.
Parliament of Japan - The National Diet
The Japanese Parliament is called the Diet. It consists of the House of Representatives and the House of Councillors. The members of the Diet are elected by the Japanese people.
Government Publications of Japan
Official publications from the Government of Japan including news bulletins, newsletters, journals and magazines.
Prime Minister of Japan and His Cabinet includes Speeches and statements by the Prime Minister, Diplomatic relations, Cabinet decisions and other announcements.
Statistics Bureau, Statistics Japan
e-Stat, Portal site of official statistics of Japan