Patent ID: 8855865

Claim:
A collision determination device for determining occurrence of a collision against a door part of a vehicle, the collision determination device comprising: a door acceleration detector, integrated with the door part of the vehicle, that detects an acceleration generated on the door part of the vehicle and a direction of the acceleration; and a collision determination part that determines that no collision has occurred against the door part from an outside in response to detecting that the direction of the acceleration is an opening direction of the door part by the door acceleration detector based on a polarity of a value that is obtained by integrating the acceleration detected by the door acceleration detector for a predetermined period of time being inverted relative to a polarity of an acceleration obtained when a collision has occurred against the door part from the outside, and that determines that the collision has occurred against the door part from the outside, when the direction of the acceleration detected by the door acceleration detector is a closing direction of the door part, based on the polarity of the value being noninverted relative to the polarity of the acceleration obtained when the collision has occurred against the door part from the outside.