COLLISION AVOIDANCE ASSISTANCE DEVICE

Provided is a collision avoidance assistance device with improved functionality and usability, which can suppress an excessive application or emergency application of the brakes in assisting avoidance of a collision with an object traveling in a lane orthogonal to a host vehicle (a road crossing the host vehicle). The collision avoidance assistance device calculates an amount of time to reach a predicted collision point that is an estimated amount of time until the host vehicle reaches the predicted collision point when the host vehicle is decelerated by a predetermined deceleration or braking force, and changes (increases or decreases) a brake application determination threshold based on a predicted passing time and the amount of time to reach the predicted collision point, the predicted passing time being an estimated time required for the object to pass through an intersecting region (predicted intersecting region) between a predicted path of the object (predicted target path) and a predicted path of the host vehicle (predicted host vehicle path).