BATTERY PACK

Disclosed herein relates to a battery pack for accommodating battery modules. More specifically, the battery pack of the present invention includes a pack case including a module area where the battery module is seated, wherein the pack case includes: a base plate; a side wall coupled along the perimeter of the base plate; and a support wall coupled to an inner surface of the side wall, wherein the support wall includes a coupling part protruding in a ribbed shape on one side opposite the side wall, and the side wall includes an insertion groove recessed for insertion of a coupling part of the support wall on the inside.