Patent ID: 8772925

Claim:
A cooling unit comprising: a first member having a plate shape and being made of a carbon-base material, the first member serving as a heat diffusion member that transfers heat at least in a thickness direction, which is perpendicular to a plane of the plate shape; a heat source disposed at a first side of the first member; a second member disposed at least at one of the first side and a second side of the first member; a cooler disposed at the second side of the first member for cooling the heat source; and a bonding member bonding the first member and the second member to each other, wherein: the first member has a metal thin film at least on an opposed surface that is opposed to the second member, the bonding member is disposed between the opposed surface of the first member and the second member, the bonding member is provided by a sintered body of metal particle, the heat diffusion member provided by the first member is a first heat diffusion member; the second member has a plate shape and is made of a carbon-base material, and the second member has a metal thin film at least on an opposed surface opposed to the first heat diffusion member and serves as a second heat diffusion member to transfer heat in the thickness direction.