PERIPHERY MONITORING DEVICE

A periphery monitoring device includes: an acquisition unit that acquires capture images which are captured by an imaging unit in time series when a vehicle is moving, the imaging unit being provided in the vehicle and capable of imaging surroundings of the vehicle; and a restoration processing unit that, in a case where dirt is present in a latest capture image among the capture images, inputs the capture images into a first learned model and generates a first restoration image as a restoration image obtained by restoring a region concealed with the dirt in the latest capture image, the first learned model being a result obtained by machine learning a relationship between a first learning image in which learning dirt is not present and first learning dirt images each of which is made by causing the learning dirt to be present in the first learning image.