To provide a battery cooling structure of a vehicle allowing reduction of weight and cost and an effective use of an interior space by reducing the number of parts.

In the cooling structure for a battery 9 arranged on a floor panel 3 of the vehicle, the battery 9 is disposed from a lower part of a front seat to the foot of a rear seat in a vehicle longitudinal direction, a duct 10 for heating the foot of the rear seat extended from an air conditioning unit mounted in a vehicle front part to a vehicle rear side is connected to the battery 9, an exhaust duct 12 extended from the battery 9 to the vehicle rear side is connected to a closed section space S formed in a rising part of a rear floor 13, and an exhaust hole 14a is formed in a panel 14 constituting the closed section space S.