noun
Imperial Guard Headquarters
Official name of the organization responsible for the security of the Imperial Palace and the Imperial Family.
皇宮警察本部は皇居の警備を担当している。
The Imperial Guard Headquarters is in charge of security for the Imperial Palace.
Compound of 皇宮 (kōgū, 'Imperial Palace') + 警察 (keisatsu, 'police') + 本部 (honbu, 'headquarters').