Parking assistance method and parking assistance device

A parking assistance method according to the present disclosure is a method of performing autonomous travel of a vehicle based on a travel route generated using teaching travel by a driver. The parking assistance method includes: acquiring a position of the vehicle and an azimuth in a travel direction of the vehicle; outputting, based on the position and the azimuth in the travel direction, when the vehicle is located and oriented with a prescribed azimuth in a prescribed position, a notification to a user to prompt an operation to start parking assistance; and receiving the operation by the user to start the parking assistance. The prescribed position is located within a range of a prescribed distance from a start position of the travel route.