Patent Office General Building, Government office building in Chiyoda, Japan

The Japan Patent Office Building is a modern administrative complex in central Tokyo that houses multiple floors of specialized departments handling patents, trademarks, and intellectual property matters. The spaces are functionally designed to support the work of examiners and specialists who process applications and registrations daily.

Completed in March 1989, the building replaced the 1934 former headquarters known as Sannenchō Chōsha after the old local place name. It was Japan's first intelligent building for a government agency and the largest such structure, public or private, at the time. The site previously held the Edo-period residence of the Naitō family of Hyūga-Nobeoka Domain.

The site in Kasumigaseki was occupied in the Edo period by the residence of the Naito family, lords of Hyuga-Nobeoka. The 1934 former building was called Sannenchō Chōsha after the old local place name. The current building, completed in 1989, was Japan's first intelligent government office building.

The building is easily accessible near Kasumigaseki Station and reachable by public transportation. Visitors can attend information sessions about patent and trademark procedures, though it is advisable to check in advance which areas are open to the public.

The 1989 building replaced the 1934 former office, known as Sannenchō Chōsha after the old local place name. It was Japan's first intelligent government office building and, at completion, the largest such building in the country, private sector included.