The head office or main headquarters of a company; the central office that manages corporate operations.
本社に出張して経営会議に参加した。
I went on a business trip to the head office to attend a management meeting.
このプロジェクトは本社の承認が必要だ。
This project requires approval from headquarters.
本社は東京にあり、全国に支社がある。
The head office is in Tokyo, and there are branch offices nationwide.
The main shrine — the principal Shinto shrine representing a region or organization.
その町の祭りは毎年本社で行われる伝統行事だ。
The town's festival is a traditional event held each year at the main shrine.
May be used to mean 'this company' or 'this shrine' in context; a shorthand within corporate or institutional speech.
本社としては、環境対策をさらに強化する方針です。
As for this company, the head office plans to further strengthen environmental measures.