A collision avoidance apparatus is provided with an intersection determination unit, a dead angle determination unit, a right-left turn determination unit and a collision avoidance control unit.The collision avoidance control unit is configured to relax, when the right-left turn determination unit determines that the own vehicle makes a right turn or a left turn and the dead angle determination unit determines presence of the dead angle region, an operational condition of a collision avoidance process compared to a case where the dead angle region is not present, in order to avoid a collision between the own vehicle and a straight-running vehicle running on the opposite lane.