A battery module, comprising: a battery assembly configured to include a plurality of pouch type secondary batteries, the battery assembly has a front side, a rear side, an upper side, a lower side, a left side and a right side (220a, 220b, 220c, 220d, 220e, 220f); wherein the pouch type secondary batteries have electrode leads 111 protruding forward and rearward formed at the front side and the rear side of the battery assembly; and a module housing including a first frame located at the left side of the battery assembly and having a plate shape whose both ends are bent rightward so that the bent portions are respectively located at the upper side and the lower side of the battery assembly to surround at least a portion of each of the upper side and the lower side of the battery assembly, and a second frame located at the right side of the battery assembly and having a plate shape whose both ends are bent leftward so that the bent portions are respectively located at the upper side and the lower side of the battery assembly to surround at least a portion of each of the upper side and the lower side of the battery assembly and are coupled with the bent portions of the first frame, wherein ends of the bent portions of the first frame are overlapped with ends of the bent portions of the second frame, respectively, wherein a male-female coupling unit having a male-female coupling structure is respectively provided to the overlapped portions of the first frame and the second frame to restrict movement of the first frame and the second frame, wherein an inner wall is formed at an inner side of the first frame or the second frame to extend from an inner upper portion to an inner lower portion thereof. a battery assembly configured to include a plurality of pouch type secondary batteries, the battery assembly has a front side, a rear side, an upper side, a lower side, a left side and a right side (220a, 220b, 220c, 220d, 220e, 220f); wherein the pouch type secondary batteries have electrode leads 111 protruding forward and rearward formed at the front side and the rear side of the battery assembly; and a module housing including a first frame located at the left side of the battery assembly and having a plate shape whose both ends are bent rightward so that the bent portions are respectively located at the upper side and the lower side of the battery assembly to surround at least a portion of each of the upper side and the lower side of the battery assembly, and a second frame located at the right side of the battery assembly and having a plate shape whose both ends are bent leftward so that the bent portions are respectively located at the upper side and the lower side of the battery assembly to surround at least a portion of each of the upper side and the lower side of the battery assembly and are coupled with the bent portions of the first frame, wherein ends of the bent portions of the first frame are overlapped with ends of the bent portions of the second frame, respectively, wherein a male-female coupling unit having a male-female coupling structure is respectively provided to the overlapped portions of the first frame and the second frame to restrict movement of the first frame and the second frame, wherein an inner wall is formed at an inner side of the first frame or the second frame to extend from an inner upper portion to an inner lower portion thereof.