BASE ASSEMBLY, AND PERIPHERY MONITORING DEVICE FOR VEHICLE

To provide a base assembly capable of restricting an edge part of a cover from moving. The base assembly includes base, gasket and cover, in which the base includes a fixing part and an attaching part, the gasket is attached to the fixing part, the cover is attached at the fixing part and the attaching part, and a lower edge part of the cover facing lower edge parts of the fixing part and the gasket has a vertical edge part, the lower edge part of the gasket has a horizontal edge part, stopper parts to restrict the vertical edge part from moving with respect to the lower edge part of the base are provided at the base and the cover, respectively, and the stopper part on the base's side is provided vertically, and the stopper part on the cover's side is provided horizontally.