A collision avoidance assist apparatus, comprising: a front target information acquisition device (11,12) configured to detect a target that exists in a predetermined front region (Rf) including at least a front side of an own vehicle, and to acquire, as front target information, information on the detected target; a front-and-lateral target information acquisition device (13L, 13R) configured to detect a target that exists in a predetermined front-and-lateral region (Rs, Rt) including at least a diagonally front side and a lateral side of the own vehicle, and to acquire, as front-and-lateral target information, information on the detected target; a vehicle information acquisition device (14, 15, 16) configured to acquire vehicle information including a speed of the own vehicle and at least one of a yaw rate of the own vehicle or a steering input value being an input value which is based on steering operation of the own vehicle; and a control unit configured to execute, as collision avoidance assist control, at least one of warning control of issuing a warning to a driver of the own vehicle and automatic braking control of automatically applying a braking force to the own vehicle, when a target satisfies a collision condition that is satisfied when it is determined that the own vehicle is liable to collide with the target based on the front target information and the front-and-lateral target information, wherein the control unit is configured to select, from among targets included in the front-and-lateral target information, targets that satisfy a predetermined selection condition, and to determine whether each of the selected targets satisfies the collision condition, and characterized in that, when determining whether each of the selected targets satisfies the collision condition, the control unit is configured to determine whether the own vehicle is turning based on the vehicle information, and to change the selection condition between a case in which the own vehicle is not turning and a case in which the own vehicle is turning. a front target information acquisition device (11,12) configured to detect a target that exists in a predetermined front region (Rf) including at least a front side of an own vehicle, and to acquire, as front target information, information on the detected target; a front-and-lateral target information acquisition device (13L, 13R) configured to detect a target that exists in a predetermined front-and-lateral region (Rs, Rt) including at least a diagonally front side and a lateral side of the own vehicle, and to acquire, as front-and-lateral target information, information on the detected target; a vehicle information acquisition device (14, 15, 16) configured to acquire vehicle information including a speed of the own vehicle and at least one of a yaw rate of the own vehicle or a steering input value being an input value which is based on steering operation of the own vehicle; and a control unit configured to execute, as collision avoidance assist control, at least one of warning control of issuing a warning to a driver of the own vehicle and automatic braking control of automatically applying a braking force to the own vehicle, when a target satisfies a collision condition that is satisfied when it is determined that the own vehicle is liable to collide with the target based on the front target information and the front-and-lateral target information, wherein the control unit is configured to select, from among targets included in the front-and-lateral target information, targets that satisfy a predetermined selection condition, and to determine whether each of the selected targets satisfies the collision condition, and characterized in that, when determining whether each of the selected targets satisfies the collision condition, the control unit is configured to determine whether the own vehicle is turning based on the vehicle information, and to change the selection condition between a case in which the own vehicle is not turning and a case in which the own vehicle is turning.