Hole-sealing cover wherewith, while securing space for a moving part such as the end of a suspension arm, the size of a hole in a member being attached to can be made small. The hole-sealing cover is shaped so that it can be inserted into a hole in a bracket, includes a vessel-shaped main cover body which has a space for an end to move in formed inside, and a flange, formed at the peripheral edges of the main cover body, for preventing excessive insertion, in which main cover body, at the top part thereof forming a vessel-shaped bottom surface, a hinge is formed which extends, crossing the top part linearly, which hinge exhibits elasticity wherewith the width in a direction crossing the hinge can be reduced by a pressing force and wherewith the width is restored to the original width when the pressing force is released.