BATTERY PACK

Disclosed herein relates to a battery pack in which battery modules housed, including: a pack case including a the module area where the battery module may be seated; and a top cover coupled to the pack case to cover the top part of each battery module seated in the pack case, wherein the pack case includes: a base plate supporting a lower part of the battery module; and a side wall coupled along a border of the base plate, wherein the base plate is less thick than the top cover.