In the present invention, a battery storage block (1) is provided with a plurality of block pieces (10) having battery storage units (11) that store a battery (2). The plurality of block pieces (10) are arranged, and from the plurality of block pieces (10), two block pieces (10) that are adjacent to each other are joined together. Between the two block pieces (10) that are adjacent to each other a gap (15) is provided that serves as a circulation space which enables a medium to circulate.
