MAGNETRON, MAGNETRON CATHODE BODY MANUFACTURING METHOD, AND CATHODE BODY

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It is an object of the present invention to obtain a cathode body capable of maintaining a long service life even when a high current flows therethrough. According to the present invention, it is possible to obtain a magnetron cathode body including, as a base material, a high-melting-point metal containing an electron emission material, and rare-earth boride coating a surface thereof. As the electron emission material and the high-melting-point metal, La2O3 and W are desirable, respectively. As the rare-earth boride, LaB6 is preferable.