COLLISION DETERMINATION DEVICE

In a collision determination device for determining a type of front collision of a vehicle, a collision determination unit is configured to determine that the collision type is full overlap front collision as collision of the vehicle with an obstacle across substantially the entire width of a front surface of a vehicle body in a case where initial values as values at an early phase of the collision for a first lateral acceleration and a second lateral acceleration are both less than a full overlap determination threshold as a negative value.