A method of molding a clip mount on a baseboard includes: forming a clip mount forming space with a die set including at least first slide die and second slide die; injecting molten resin into the space; forming a first wall; forming a connecting wall so as to extend from a distal end of the first wall such that a distance between the connecting wall and a surface of the baseboard increases as a distance from the first wall increases; forming a second wall; forming a mount wall so as to extend from an end of the second wall such that a distance between the mount wall and the connecting wall increases as a distance from the second wall increases; sliding the first slide die for removal; and sliding the second slide die in a different direction from a direction in which the first slide die is slid for removal.