In a battery cooling device 1 that cools a battery 2 that is arranged in a battery accommodation space 5 by taking in the air in a passenger compartment 6 through an air intake port part 12 provided in a vehicle interior trim 7 and a first air intake pipe 13, the first air intake pipe 13 is provided with an auxiliary air intake port 31 that opens to a space 30 formed between the vehicle interior trim 7 and a vehicle interior panel 8 that is located at a passenger-compartment outer side of the vehicle interior trim 7.