The main building of a complex (as opposed to annexes or outbuildings); the principal structure.
チェックインは本館でお願いします。
Please check in at the main building.
学部の事務室は本館二階にあります。
The department office is on the second floor of the main building.
別館は改装中なので、本館を利用してください。
The annex is under renovation, so please use the main building.
Used within an institution to refer to this building (e.g., 'this library's main building'); often appears on signs and announcements.
本館は本日休館です。別館は通常通り開館しています。
The main building is closed today. The annex is open as usual.
展覧会は本館で開催中です。入場は無料です。
The exhibition is being held in the main building. Admission is free.
研究室は本館の奥の部屋にありますので、3階までお越しください。
The laboratory is in a room at the back of the main building, so please come up to the third floor.