COLLISION DETERMINATION SYSTEM, OCCUPANT RESTRAINT SYSTEM, AND VEHICLE

The invention provides an effective technique for appropriately restraining a vehicle occupant at the time of a side collision of a vehicle. An occupant restraint system (100) mounted to a vehicle comprises a camera (110), a side impact sensor (120), an acceleration sensor (130), an ECU (140), and an airbag module (150). The ECU (140) changes a threshold value setting for collision velocity at the time of a side collision of the vehicle (10) according to whether or not a colliding object (P) involved in the side collision of the vehicle (10) is a pole-like object, and controls the airbag module (150) based on the set threshold value.