To cut off an amount of use of materials without degrading load stability of a magnetron.

To a vane 2 of the magnetron provided with an anode cylinder 1 extended in a cylinder shape along a center axis 30, a spiral cathode 5 arranged at the center axis 30, and a pair of end hats 6, 7 fastened to either end of the cathode 5, a loose end 31 of a main body part 34 extended in a flat shape from the loose end 31 parallel with the center axis 30 and opposed to the cathode 5 to a fixed end 35 fastened to an inner face of the anode cylinder 1 is to be equipped with burrs 33 in order to be extended along the center axis 30.