X-ray generation apparatus and x-ray imaging apparatus

An X-ray generation apparatus comprising:

• an X-ray generation tube including an insulating tube with a first opening end and a second opening end, a cathode arranged to close the first opening end and including an electron emitting portion that emits electrons in a first direction, and an anode arranged to close the second opening end and including a target that generates X-rays when electrons radiated from the electron emitting portion collide;
• an accommodating container including a first portion forming a first space, a second portion having a smaller width in a second direction orthogonal to the first direction than the first space and arranged to surround at least a part of the X-ray generation tube, thereby forming a second space, and a connecting portion connecting the first portion and the second portion to each other to form an internal space in which the first space and the second space communicate, the connecting portion including a convex portion pointed toward the internal space;
• a first insulating portion arranged between the convex portion and the X-ray generation tube to be spaced apart from the X-ray generation tube, and surrounding the X-ray generation tube;
• and
• a second insulating portion arranged to be in contact with at least a portion of the X-ray generation tube and be spaced apart from the first insulating portion, and surrounding the X-ray generation tube,
• wherein an outer diameter of the second insulating portion is larger than an inner diameter of the first insulating portion.