Provided are collision avoidance apparatus and method for a vehicle, which are capable of maintaining a braking force and assisting a steering force by providing a braking control signal and a steering control signal to a wheel of a driver's steering intention direction during braking for collision avoidance, thereby achieving lateral avoidance. The collision avoidance apparatus for the vehicle includes: a measurement unit configured to measure a motion of an opposite vehicle; and an electronic control unit configured to determine whether there is a risk of collision with the opposite vehicle, based on a measurement result from the measurement unit, and, when it is determined that there is the risk of collision, provide a braking control signal and a steering control signal to an actuator for controlling a wheel of a driver's steering intention direction and provide a braking release signal for releasing a braking force from a wheel opposite to the driver's steering intention direction.