Vehicle collision avoidance support device and vehicle collision avoidance support program

Provided are a vehicle collision avoidance support device and a vehicle collision avoidance support program with which it is possible to avoid the execution of unnecessary collision avoidance control during a right turn or a left turn. A vehicle collision avoidance support device (10) predicts a turning path of a host vehicle (100) and a movement path of a target object (200) in front of the host vehicle (100) during turning of the host vehicle (100). The vehicle collision avoidance support device acquires, as a collision angle, an amount at which the travel direction of the host vehicle deviates from a line orthogonal to the movement path at a point at which the turning path and the movement path intersect. The vehicle collision avoidance support device does not execute collision avoidance control even if a collision condition is satisfied when a prohibition condition that the collision angle is equal to or greater than a predetermined collision angle threshold value is satisfied, and executes collision avoi