A battery-pack storage structure includes: a battery-case upper part configured to store a battery stack; a battery-case lower part; and a cooling air path through which cooling air for cooling the battery stack flows. The battery-case upper part is disposed on the battery-case lower part, and a bottom-part cooling air path, through which the cooling air flows, is formed between a bottom surface of the battery-case upper part and a bottom surface of the battery-case lower part.