ELECTRON GUN ASSEMBLING JIG

PROBLEM TO BE SOLVED: To lower the inclination of an electrode against a tube axis so as to improve the assembling accuracy of electron gun by integrally forming a periphery positing member, which is fixed to a base material and which holds the periphery of an electrode, with a rotation preventing member for regulating the rotation of the electrode. SOLUTION: In an electron gun beading magazine 30, a plate guide 31 is integrally formed with a rotation stopper by cutting, and formed of a plate guide part 31A and a rotation stopper part 31B. The plate guide 31 is directly fixed to a base material 10 by screwing. Since the rotation stopper part 31B is integrally formed with the plate guide 31, which is fixed to the base material 10 and which holds the periphery of an electrode member 2D, even in the case where assembling of electron gun is repeated and various stress is applied, the rotation stopper part 31B can be held at the predetermined position, and the inclination of the electrode member 2D due to the generation of displacement of the rotation stopper part 31B can be thereby effectively avoided.