The area of Sera was part of an ancient
Bingo Province. For the
Heian period, Sera was an estate and market town centered on the temple of Ryuge-ji, which belonged to the
Shingon center of
Mount Koya. The need to make shipments of rice to Mount Koya triggered the construction of a port in Onomichi. During the
Edo Period, the area was part of the holdings of
Hiroshima Domain and developed as a
post town on the Iwami Ginzan Highway . Following the
Meiji restoration, the area was organized into villages within
Sera District, Hiroshima with the creation of the modern municipalities system on April 1, 1889. The villages of Omi, Nishi-Ota, and Higashi-Ota merged to become the town of Sera on January 10, 1955. On October 1, 2004, the towns of
Kōzan and
Seranishi, both from
Sera District, were merged into the expanded town of Sera. After the merger, the former Sera Town Hall officially closed down and the new town hall is now located in the former town of Kōzan. ==Government==