The aim of this paper is to study how Japan's courts, particular the Supreme Court, influence on the economic regulatory policies by using the power of judicial review from the viewpoints of the constitution and policy. Firstly, this paper introduces the regulations of economic activities by the government. Secondly, it studies the constitutional guarantee of freedoms to choose an occupation and conduct business, which are regarded as basic human rights. Thirdly, it analyzes the judicial review on the regulations of economic activities. Fourthly, it examines courts' decisions on the economic regulatory policies after the de-regulation of economic activities.