A heat dissipater with an antenna structure comprises a heat conductive portion capable of being contacted with a heat source of an electronic device for heat dissipation; and an antennal portion integrally formed to the heat conductive portion so as to form as an integral body; and the antenna portion comprises at least one sheet body. A conductive layer is coated on a surface of the sheet body; in that the conductive layer can be connected to a conductive wire for being lead to the portable electronic device for signal receiving and transmission. The heat conductive portion 10 has the function of heat dissipation and the antenna portion 20 has the function of wireless transmission which are made integrally with a compact space so that the space in an portable electronic device for receiving the heat conductive device is sufficient to receiving the whole structure.