Parking Assistance Method and Parking Assistance Device

A parking assistance method of the present invention includes detecting an empty parking space around a moving object, displaying a first assistance image indicating a position of the empty parking space on a surrounding image viewed from above the moving object, and setting a parking target using the displayed first assistance image. The parking assistance method includes: determining whether the detected empty parking space meets a display condition for displaying the first assistance image; and displaying the first assistance image in the empty parking space not meeting the display condition when a currently set mode is an adjustable mode that allows an occupant of the moving object to manually adjust the parking target.