Electron beam generation source, electron beam emission device, and x-ray emission device

An electron beam generation source comprising:

• an electron discharge part extending on a desired axis and configured to discharge electrons;
• a movable part connected to one end of the electron discharge part;
• a support part configured to support the movable part to be movable along the axis;
• and
• a tension holding part configured to hold tension of the electron discharge part by applying a pressing force or a tensile force to the movable part, wherein
• the movable part and the tension holding part are disposed on the axis,
• the support part includes a housing part having an internal space for accommodating the tension holding part inside,
• the housing part includes a movable part holding part that extends along the axis and holds the movable part to be movable along the axis,
• the movable part holding part is a through hole extending along the axis and having a circular column shape, and
• the tension holding part is arranged on the opposite side of the end to which the electron discharge part is connected in the movable part.