Base assembly, and periphery monitoring device for vehicle

A base assembly comprising:

• a base;
• a gasket;
• and a cover,
• wherein
• the base includes a fixing part to be fixed to a vehicle body and an attaching part, an upward portion of the attaching part being attached to a monitoring assembly,
• the gasket is attached to the fixing part to exist between the fixing part and the vehicle body,
• the cover is attached at a downward portion of the fixing part and at a downward portion of the attaching part to cover the downward portion of the fixing part and the downward portion of the attaching part, and an edge part among edge parts of the cover that faces an edge part at the downward portion of the fixing part and an edge part at a downward portion of the gasket has a vertical edge part that is provided in a vertical direction,
• the edge part at the downward portion of the gasket has a horizontal edge part provided in a horizontal direction from the edge part at a downward portion of the base toward the vertical edge part's side of the gasket,
• a plurality of stopper parts to restrict the vertical edge part from moving with respect to the edge part at the downward portion of the base by action of the horizontal edge part are provided at the edge part at the downward portion of the base and at the vertical edge part of the cover, respectively, and the stopper part on the base's side is provided in a vertical direction, and
• the stopper part on the cover's side is provided in a horizontal direction.