ELECTRON GUN ASSEMBLING JIG

PROBLEM TO BE SOLVED: To stably hold an electron gun and simplify the structure. SOLUTION: An assembly jig 1 of an electron gun 21 for holding the electron gun 21 in the specified attitude in the assembly process of the electron gun 21 has a fitting jig part 13 fit to the inner hole of the electron gun 21, and a gripping jig part 3 for gripping the side of the electron gun 21 from the both sides, and the gripping jig part 3 has a set of two gripping members 5 each comprising a main part supported in the position where the fitting jig part 13 is interposed between both sides so as to be capable of rotating and a pressing down part 9 fixed to the main part and coming in contact with the side surface of the electron gun 21, and the rotating force in the direction coming in contact with the side surface of the electron gun 21 of the pressing down part 9 is elastically energized to the main part of the gripping member 3.