Thermal diffusion plate

A good diffusion performance of the heat, moreover provides a heat diffusion plate which can be made thinner. Some of the A thin plate-like main body 2 from the outside heat the heating unit 6 is provided to be transmitted, the heating unit 6 heat diffusion plate 1 that diffuses heat to other parts of the body portion 2 from there are, along with flying among the plurality of 7 is formed so as to pass through the heating unit 6 in the main body portion 2, the hollow path 7 in communication with each other at the heating unit 6, the interior of the hollow passage 7, is heated to evaporate and heat dissipating condenses the working fluid is sealed, the interior of the hollow passage 7, the wick 8 for generating a capillary force by the liquid-phase working fluid to penetrate the interior of the hollow passage 7 the vapor of the working fluid is placed in a state of opening the steam flow path 9 that flows, together with a portion of the wick 8 is located in the heating unit 6, the steam path formed inside of the hollow passages 7 9 are communicated with each other at the heating unit 6. .FIELD 1