A parking assist system includes a server device and a parking assist device provided in a host vehicle to communicate with the server device. The server device comprises a server storage portion that is configured to store parking lot information acquired when a second vehicle different from the host vehicle is parked in a parking section of a parking lot. The parking assist device includes a parking lot information receiver configured to receive the parking lot information from the server device, and a parking assist controller configured to control the host vehicle based on the obtained parking lot information to park the host vehicle in the parking section of the parking lot.