X-ray fluorescence analyzer and x-ray aperture member

An X-ray fluorescence analyzer comprising:

• an X-ray tube;
• an aperture member configured to narrow an irradiation range of primary X-rays generated by the X-ray tube;
• and
• an analysis unit configured to analyze fluorescent X-rays generated from a sample when the sample is irradiated with the primary X-rays that have passed through the aperture member,
• wherein the aperture member includes
• a first opening formed on an incident side of the primary X-rays,
• a second opening formed on an emission side of the primary X-rays, and
• a hole formed between the first opening and the second opening,
• wherein when a direction from a center of the second opening toward an edge portion that is a corner of a peripheral portion of the second opening is referred to as a first direction,
• the aperture member includes a shielding portion formed on an inner surface of the hole, the shielding portion being formed between the X-ray tube and the peripheral portion of the second opening and on a side in the first direction from a straight line connecting the X-ray tube and the edge portion of the second opening.