An imaging device equipped with an imaging system includes an imaging lens optical system which images an object, a flash emitting unit which synchronizes imaging in the imaging system to emit a flash having not less than a prescribed luminance in a charged state not less than a prescribed charged state by power to be charged, and a control unit which determines a charging amount of the charged state of the flash emitting unit and which controls imaging to be performed by using the flash emitting unit with an imaging sensitivity of the imaging lens optical system set in accordance with the charging amount of the charged state in imaging by the imaging lens optical system.