A parking assist apparatus assisting a parking operation of a vehicle includes an image capturing portion capturing an image of a backward view of the vehicle, a displaying portion displaying the captured image at an inside of the vehicle, a guiding portion guiding the vehicle to a target parking space when the vehicle reverses with a turning movement based on a predetermined steering angle held by an operator of the vehicle, and a superimposing portion superimposing a first assist line arranged in the target parking space to be in parallel to a front-rear direction of the target parking space and a second assist line extending to a backward area of the vehicle to be in parallel to a front-rear direction of the vehicle on the captured image. The first and second assist lines are possibly overlapped each other when a vehicle reverse movement with the turning movement is completed.