A mounting structure for an engine cover includes: a protruded member which has a neck and a head with a larger diameter than the neck; and a recessed member which has an external circumferential surface small diameter section to be locked to a mounting hole of a mounting seat arranged so as to be opposed to the protruded member, and a concave holding the head of the press-fit protruded member. In the protruded member, at least a portion surrounding the concave is formed solid. The head is arranged closer to a rear surface of the engine cover than the mounting hole. A compression space, which is compressed in the case in which a collision load equal to or larger than a predetermined value is applied in a front and rear direction of the engine cover, is defined between the recessed member and the rear surface of the engine cover.