In a battery cooling air intake structure, in which a trunk side lining (35) of a vehicle body side part is disposed so as to be continuous with a side part of a seat back (32) of a seat for a passenger to sit on, and a battery is cooled using, as cooling air, air within a vehicle compartment taken in via an intake port (36) provided in a front face (35a) of the trunk side lining (35), since a seat belt (38) is disposed so that at least part thereof in a non-used state overlaps the intake port (36) when viewed in the vehicle body fore-and-aft direction and a predetermined gap (b) is formed between the intake port (36a) and at least part of the seat belt (38) when viewed in the vehicle width direction, it is possible to prevent interference with the intake of cooling air due to the intake port (36) being blocked by the seat belt (38), while disposing the seat belt (38) as far toward the outside in the vehicle width direction as possible so that it does not overlap the seat back (32).