The present invention relates to a container for an energy storage apparatus, the container comprising: a container body having an upper plate, a lower plate, and a plurality of side walls finished to each other to form an inner space; a first support frame installed on the upper plate of the container body; a second support frame installed on the lower plate of the container body; and one or more vertical frames vertically coupled to the first and the second support frames and constituting a vertical frame of a generally used battery rack.