noun
codified constitution; written constitution
A constitution that exists as a single written document, as opposed to an uncodified one based on conventions and statutes. Often contrasted with 不文憲法 (unwritten constitution).
See also: 不文憲法
日本国憲法は成文憲法の一つです。
The Constitution of Japan is an example of a codified constitution.
Please explain the difference between a written constitution and an unwritten constitution.