Cover for internal combustion engine

A cover for an internal combustion engine, the cover being configured to be attached to an engine main body and cover a timing chain or a timing belt, the cover comprising:

• a first member made of a hard plastic;
• and
• a second member made of a material different from the hard plastic, wherein
• the first member is formed by insert molding with the second member as an insert,
• the second member includes a joint surface in a periphery of the second member, the first member being joined to the joint surface,
• the joint surface includes:
• a first joint portion that includes a lattice-shaped recess portion;
• and
• a second joint portion that includes grooves, the grooves extending in an extending direction in which the periphery extends, and the grooves being arranged in an intersecting direction that intersects with the extending direction, and
• the second joint portion is provided to be closer to a space adjacent to the periphery than the first joint portion.