Heatsink

A heatsink comprising:

• a heat transport member having a heat receiving portion thermally connected to a heating element;
• a pipe body connected to a heat radiating portion of the heat transport member;
• and a heat radiating fin group which is thermally connected to the pipe body and in which a plurality of heat radiating fins is arranged, wherein
• the heat transport member has an integral internal space that communicates from the heat receiving portion to a connection portion with the pipe body and that is filled with a working fluid, the internal space of the heat transport member communicating with an internal space of the pipe body,
• a cross-sectional area of an internal space in a direction orthogonal to a heat transport direction of the heat transport member in the heat radiating portion is smaller than the cross-sectional area in a heat insulating portion between the heat receiving portion and the heat radiating portion,
• a wick structure extended from the heat receiving portion to the heat radiating portion is provided in the internal space of the heat transport member, a different wick structure is provided in an inner surface of the pipe body, and the wick structure and the different wick structure are connected via a connection member having capillary force, the connection member being a wick member having capillary force, and
• a kind of the wick structure provided in the heat transport member, a kind of the different wick structure provided in the pipe body, and a kind of the wick member are different.