A specimen supporting member (10) includes: a specimen supporting film (11) such as a silicon nitride film, a carbon film, and a polyimide film; an X-ray radiation film (13) provided on one principal surface of the specimen supporting film, and for radiating a characteristic X-ray in a soft X-ray region upon irradiation with charged particles; and a specimen adsorption film (12) which is a metal film provided on another principal surface of the specimen supporting film (11), and which fixes by adsorption a specimen (1) to be observed. Since a protein which is a constitutive substance of a biological specimen has a characteristic to easily adsorb to a metallic ion, a specimen adsorption film (12) is formed on one principal surface of the specimen supporting film (11) so that an observation specimen adsorbs thereto.
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