SERVICE HOLE COVER AND VEHICLE UNIT MOUNTING STRUCTURE

A ceiling portion (60) of a service plug cover (50) that is made of resin is convex toward a vehicle vertical direction lower side (floor panel (14) side), and a groove-shaped concave portion (62) is formed in a top surface (60A). Further, the concave portion (62) of the top surface (60A) of the ceiling portion (60) is groove-shaped, and both end portions thereof in a groove direction (vehicle longitudinal direction) are open.