Cooling system

A cooling system of an embodiment is provided, for example, with a container, a chassis, and a duct. The container is provided with: an inflow path extending in a first direction; outflow paths positioned in a second direction intersecting with the first direction of the inflow path and extending in the first direction; an inflow port communicating with the inflow path and through which cooling air from an air-conditioning device flows in; and outflow ports communicating with the outflow paths and through which the cooling air flows out. The chassis has rack parts arranged between the inflow path and the outflow paths and accommodating multiple heat-generating modules therein, and intermediate paths extending between the inflow path and the outflow paths are disposed in the rack parts. The duct is for connecting the inflow port with a discharge port of the air-conditioning device and has an inclined surface facing the cooling air which is inclined toward the second direction while approaching the inflow port from the air-conditioning device.