There is provided a multilayered spectroscopic device effective to achieve in a short length of time the highly accurate fluorescent X-ray analysis of boron wherein the influence that may be brought about by the interfering X-rays and the background is sufficiently reduced and the strength of reflection of B-K line is sufficient. The casing is able to store toner. An optical contact-detecting unit such as a reflection-type infrared photo-coupler 9 is located inside of the cabinet face plate 6 to detect an contacting operation through the cabinet face plate 6.