An activation control apparatus of an occupant safety system is an apparatus for controlling activation of airbag system 36 mounted on a vehicle in the event of the vehicle colliding with an obstacle, which has front sensors 30A, 30B mounted in the vicinity of a colliding part of the vehicle, a floor sensor 32 mounted behind the front sensors in the vehicle, and an output control 42 for controlling an output of inflators 36A, 36B on the occasion of activation of the airbag system, based on values detected by the front sensors and floor sensor.