PURPOSE: To provide a magnetron whose manufacturing process is easy, as well as capable of preventing its breakdown owing to a thermal deformation or a thermal stress generated at the tip of a vane or at an inner anode, by making the temperature at the tip of the vane, where the temperature rise is particularly, severe escape to an anode cylinder side rapidly, in a magnetron anode.

CONSTITUTION: Anode straps 4 which short-circuit vanes 2 forming small hollows of a magnetron anode, at every second vane, are formed in three sheets only at either one end in the axial direction of the vanes, while no groove for anode strap is formed at the other end, so as to increase the heat conduction from the tip, and also to make the assembly work easier.