Emitter and X-ray tube device

An X-ray tube device comprising:

• an anode configured to emit an X-ray when the anode is irradiated with electrons;
• an emitter configured to irradiate the anode with the electrons, the emitter comprising:
• an electron emission portion to be heated by an electric current;
• a current application leg for supplying the electric current to the electron emission portion, the current application leg extending from the electron emission portion in a direction vertical to the electron emission portion;
• a support leg extending from the electron emission portion in the direction vertical to the electron emission portion;
• a current application leg fixing portion for supporting the current application leg and supplying the electric current to the current application leg;
• and
• a support leg fixing portion for supporting the support leg, wherein
• at least one of materials and shapes are different between the current application leg fixing portion and the support leg fixing portion so that a difference in an amount of thermal deformation between the current application leg and the support leg in the direction vertical to the electron emission portion is reduced when the electron emission portion is heated by the electric current.