Patent ID: 7773726

Claim:
An X-ray tube for bringing electrons emitted from an electron gun into collision with a target to generate X-rays, comprising: a metallic enclosure main body for housing therein the electron gun; a cylindrical valve, formed of an insulating material, with an opening portion on one end side thereof being fixed to the enclosure main body, while the other end side thereof is formed as a narrowed portion having a fixation portion, wherein the fixation portion is not surrounded by the valve; and a target support body inserted in the valve to support the target, wherein an opening portion on the other end side of the valve is fixed to the target support body, and a shield portion is formed between the enclosure main body and the opening portion on the other end side of the valve, the shield portion being adapted to shield the fixation portion where the target support body and the opening portion on the other end side of the valve are fixed to each other when viewed from the one end side of the valve.