The article presents the stages of creation and development of the party system and political parties in Japan, as well as various definitions of the party system, and assesses the directions of evolution of the Japanese political system. In addition, the genesis and activities of the Liberal Democratic Party were outlined, as well as the topic of transparency and legal regulations in the area of financing political activities in Japan. In order to present the evolution of Japan's political system, one must deal not only with legal regulations regarding the party, electoral and political system, but also with issues such as political culture, history and various conditions, i.e. everything that influenced the evolution of a given political system. countries. Party systems remain closely related to the political systems within which they operate, which results in the observable difficulty with which their comparative analyzes or broader and more general characteristics are created.