One of two remaining gates of the Edo period daimyō mansions in the city (the other one is Kuromon, currently located in the Tokyo National Museum).

The purpose of the gate was to welcome Lady Yasu-hime, a daughter of Tokugawa Ienari, as a bride for Nariyasu Maeda.

It is currently located in the grounds of the University of Tokyo, and it has been designated an Important Cultural Property.

[7] At the end of the Meiji period (1868-1912), it was moved to its current location, 15 meters west of where it originally stood.

[8] Akamon is located in the grounds of the Hongo Campus in the University of Tokyo.