Parking assistance device

Abstract

A parking frame for which a parking route cannot be generated is excluded from selection objects by a simple determination. The parking assistance device acquires information on an entrance width of a frame entrance of the parking frame and information on a passage width of a passage, and calculates a minimum projection amount wm in a passage width direction of a vehiclefrom the parking frameto the passagewhen a vehicle corner on a front side of the vehicle in an approach direction to the parking frame and on a first side in a vehicle width direction is located at the entrance end on the first side of the parking frame in the frame width direction, and when the vehicle is disposed at a position where the vehicle side part on a second side of the vehicle in the vehicle width direction is in contact with the entrance end on the second side of the parking frame in the frame width direction. This minimum projection amount wm is a minimum passage width required for rotating the vehicle from a direction at a start of parking to a direction at a completion of parking without considering a turning radius in a space configured by the parking frame and the passage. The passage width wr is compared with the minimum projection amount wm, and when the passage width is smaller than the minimum projection amount, it is determined that the vehicle cannot be parked in the parking frame.