Abstract: To prevent reduction in cruising distance due to usage of electric power for anti-fogging of a window, heating of a vehicle interior, or the like when an electric vehicle or the like that runs by power supply from an in-vehicle battery is running, vehicle interior air that has passed through heat exchanging means for exchanging heat between vehicle interior air and outside air is introduced into a dehumidifying member. Therefore, the dehumidifying member can absorb moisture from air having a relative humidity that is relatively high, and hence a larger amount of moisture can be absorbed even with the same dehumidifying member.