An information processing device includes: an object to be cooled (51, 52) as a heat-generating body; a cooling unit (32) that is provided on a first side of the object (51) to be in contact therewith; and a plate spring (36) disposed on a second side of the object (51) opposite to first side and attached to the cooling unit (32), the plate spring biasing the cooling unit (32) in a direction for the cooling unit (32) to be pressed to the object (51). Since the object (51) and the cooling unit (32) can be brought in closer contact with each other, the heat on the object (51) can be efficiently transferred to the cooling unit, thereby radiating the heat. Accordingly, the heat generated on the object (51) can be efficiently cooled. The object (51) is sandwiched by the plate spring (36) and the cooling unit (32), unidirectional load is not applied on the object (51), so that deformation of the object (51) can be restrained.