To obtain a whitish material excellent in appearance when a material is mixed with a far infrared radiating material and used, to reduce a manufacturing cost by widening the selection width of a raw material and to prepare an antimicrobial material.

This far infrared radiating material comprises a whitish ashed material obtained by blending a plant composed of a tree such as Japan cedar, Japanese cypress, pine tree, a weed such as burdock or a seaweed such as a tangle, WAKAME (Undaria pinnatifida) or sargasso with a shell derived from an animal composed of a shell of a Coelenterata such as clam worm, etc., an echinoderm such as a sea urchin, a mollusc such as a shellfish, etc., or an egg-shell of a vertebrate animal such as a bird, etc., in a dry weight ratio of 1:9 to 9:1 to give a composition and baking the composition under heating. The objective far infrared radiating antimicrobial agent comprises a white ashed material.