Referring to the drawings, the module housing 5 according to some embodiments may include a matching structure P11 between the first boundary portion P1a and the main boundary portion M, as a structure for reinforcing the coupling power between the first plate P1 and the main housing H formed by insert molding. Here, the matching structure P11 between the first boundary portion P1a and the main boundary portion M may denote a matching structure in which the first boundary portion P1a and the main boundary portion M that are integrally formed with each other by insert molding are inserted to each other by having a complementary shape so as not to be detached from each other. In more detail, according to various embodiments, a hole 61, a protrusion portion 62, and a concave-convex pattern 63 may be formed along the first boundary portion P1a formed at the edge of the first plate P1, and the hole 61, the protrusion portion 62, and the concave-convex pattern 63 formed along the first boundary portion P1a may be filled with or buried by portions of the main housing H formed to have complementary shapes thereto and may form an interface with the main housing H. Here, the hole 61, the protrusion portion 62, and the concave-convex pattern 63 formed in the first boundary portion P1a may be filled with or buried by the portions of the main housing H formed to have the complementary shapes thereto or may form the interface with the main housing H, and thus, the first boundary portion P1a and the main housing H may be firmly coupled with each other. Here, the portions of the main housing H forming the physical interference with the hole 61, the protrusion portion 62, and the concave-convex pattern 63 formed in the first boundary portion P1a may denote at least one of the upper width W1 or the lower width W2 of the recessed holding portion RH forming the coupling with the first boundary portion P1a, the upper width W1 covering the upper surface of the first boundary portion P1a and the lower width W2 covering the lower surface of the first boundary portion P1a. The at least one of the upper width W1 or the lower width W2 of the recessed holding portion RH may fill or bury the hole 61, the protrusion portion 62, and the concave-convex pattern 63 formed in the first boundary portion P1a or may form the interface therewith, thereby forming the solid coupling with the first plate P1.