A vehicle collision avoidance assistance device comprising a processor configured to: perform forced braking or forced steering when a driver's vehicle has a possibility of colliding with an object ahead of the driver's vehicle, the forced braking being braking for avoiding a collision between the driver's vehicle and the object by applying a braking force to the driver's vehicle to stop the driver's vehicle before the driver's vehicle collides with the object, the forced steering being steering for avoiding the collision between the driver's vehicle and the object by steering the driver's vehicle to pass by a side of the object; acquire at least one of information related to a condition of the driver's vehicle and information related to a situation around the driver's vehicle; determine, based on the acquired information, whether a request condition for requesting execution of the forced steering is satisfied and whether a forbiddance condition for forbidding the execution of the forced steering is satisfied; perform, when the request condition is not satisfied, the forced braking regardless of whether the forbiddance condition is satisfied; perform the forced steering when the forbiddance condition is not satisfied and the request condition is satisfied; and perform, when the forbiddance condition is satisfied, the forced braking though the request condition is satisfied, characterized in that the processor is configured to: determine that the request condition is satisfied when the processor determines that the braking device deteriorates based on a deterioration status of the braking device, or when the processor determines that a weight of the driver's vehicle is equal to or larger than a predetermined weight; and determine that the request condition is not satisfied when the processor determines that the braking device does not deteriorate based on the deterioration status of the braking device, or when the processor determines that the weight of the driver's vehicle is smaller than the predetermined weight. perform forced braking or forced steering when a driver's vehicle has a possibility of colliding with an object ahead of the driver's vehicle, the forced braking being braking for avoiding a collision between the driver's vehicle and the object by applying a braking force to the driver's vehicle to stop the driver's vehicle before the driver's vehicle collides with the object, the forced steering being steering for avoiding the collision between the driver's vehicle and the object by steering the driver's vehicle to pass by a side of the object; acquire at least one of information related to a condition of the driver's vehicle and information related to a situation around the driver's vehicle; determine, based on the acquired information, whether a request condition for requesting execution of the forced steering is satisfied and whether a forbiddance condition for forbidding the execution of the forced steering is satisfied; perform, when the request condition is not satisfied, the forced braking regardless of whether the forbiddance condition is satisfied; perform the forced steering when the forbiddance condition is not satisfied and the request condition is satisfied; and perform, when the forbiddance condition is satisfied, the forced braking though the request condition is satisfied, characterized in that the processor is configured to: determine that the request condition is satisfied when the processor determines that the braking device deteriorates based on a deterioration status of the braking device, or when the processor determines that a weight of the driver's vehicle is equal to or larger than a predetermined weight; and determine that the request condition is not satisfied when the processor determines that the braking device does not deteriorate based on the deterioration status of the braking device, or when the processor determines that the weight of the driver's vehicle is smaller than the predetermined weight. determine that the request condition is satisfied when the processor determines that the braking device deteriorates based on a deterioration status of the braking device, or when the processor determines that a weight of the driver's vehicle is equal to or larger than a predetermined weight; and determine that the request condition is not satisfied when the processor determines that the braking device does not deteriorate based on the deterioration status of the braking device, or when the processor determines that the weight of the driver's vehicle is smaller than the predetermined weight.