Sakae Wagatsuma (1897 – 1973) is one of the leading Japanese civil law scholars after the war and one of the members in charge of drafting major revisions to the family law accompanying the revision of the Constitution. He has long been involved in civil law legislation as a special adviser to the Ministry of Justice, and also is known as the first person in Japan who completed a comprehensive study of civil law.

“Documents Related to Sakae Wagatsuma” contains materials from the vast collection of original sources he has left in the fields of the Constitution, other public law, judiciary, civil law, civil procedure, leased land / house, and nuclear power. It contains a wealth of internal materials, especially those related to the Legislative Council's subcommittee in which he participated, especially the Extraordinary Judicial System Investigation Committee, the Judicial System Subcommittee, the Civil Code Subcommittee, and the Nuclear Disaster Compensation Subcommittee, which he chaired

Since Wagatsuma was involved in the enactment of the Nuclear Damage Compensation Law as the chairman of the Nuclear Disaster Compensation Department, he left behind a lot of materials that could clarify the legislative process in this field. For example, it contains materials that can trace the enactment of the Nuclear Power Law that was applied in the case of the Fukushima nuclear accident caused by the Great East Japan Earthquake.

In addition, this database also contains rare and valuable constitutional materials such as the Constitution Promotion Association and the Constitutional Issues Study Group that are useful not only in legal fields but also in various fields such as political history, administrative history, nuclear energy policy, and family sociology.

This database can be cross-searched with the previously published "Documents Related to Political Scientist Teiji Yabe" (「矢部貞治関係文書」).