X-ray tube

An X-ray tube comprising:

• a vacuum housing;
• an electron gun that is accommodated in the vacuum housing and emits electrons;
• and
• an anode that includes a target which is accommodated in the vacuum housing, receives electrons provided from the electron gun, and emits X-rays, and a target supporting portion which supports the target,
• wherein the target supporting portion has
• a main body portion having a columnar shape which extends in a direction of an axis line, and
• a protrusion portion including a side surface portion which extends in the direction of the axis line from the main body portion, and an inclined surface which is connected to the side surface portion, which intersects the axis line, and in which the target is disposed,
• wherein the protrusion portion has a cross section intersecting the axis line with a smaller area than the main body portion,
• wherein the main body portion includes
• an outer circumferential surface extending in the direction of the axis line, and
• a connection portion formed between the side surface portion of the protrusion portion and the outer circumferential surface, and
• wherein an angle formed by the outer circumferential surface and the connection portion is an obtuse angle.