An embodiment of the present invention relates to a coupling structure of a battery pack, and the objective of the present invention is to provide a battery pack which can stably and easily fix a bus bar. To this end, provided is a battery pack comprising: a base defining the entire bottom surface; a battery module installed on the base; a module fixing part formed to surround a side surface and an upper surface of the battery module and coupled to the base; a first bus bar fixing part coupled to the module fixing part; a bus bar disposed on the first bus bar fixing part and electrically connectable to the battery module; and a second bus bar fixing part installed to cover the bus bar and fixed to the first bus bar fixing part.