Japanese laws are composed of written laws and unwritten laws. Written laws in which the supreme statute is the Constitution of Japan, are divided into two types of law: one is national laws that are enacted by the Diet, the Cabinet and Ministries, while the other is autonomous ordinances provided by autonomous regional entities and other organizations. The kinds of unwritten laws are customary laws, case laws, construction by administration and rational laws. In Japan, construction by administration such as through notification and reply on provisions by the responsible Civil Service authorities has substantial function as law formulation.
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