Parking assist device, control method, and non-transitory storage medium

A parking assist device includes a control device configured to execute automated parking control and a notification device. The automated parking control is control for assisting an operation of a target vehicle to park the target vehicle in a predetermined target parking spot while a driver of the target vehicle sits on a driver's seat of the target vehicle. The control device is configured to calculate a frontage of the target parking spot in advance before a start of execution of the automated parking control. The control device is configured to control the notification device, based on the calculated frontage, such that the notification device gives a notification about information related to a size of a drop-off space.