Fluorescent probe of the present invention, the ions of the rare earth element which emits light of a wavelength in the near infrared region and is excited non-wavelength with light of a wavelength in the near infrared region, from the glass powder is contained within a glass Become. Method for producing a fluorescent probe of the present invention, a compound containing a rare earth element, the melting step of melting a glass raw material, cooling the melt obtained by melting step, to produce a glass composition containing ions of rare earth elements cooling step, and the crushed glass composition, a crushing step to obtain a powder, successively provided.本発明の蛍光プローブは、近赤外光域の波長の光で励起されて該波長以外の近赤外光域の波長の光を発する希土類元素のイオンを、ガラスの中に含むガラス粉体からなる。本発明の蛍光プローブの製造方法は、希土類元素を含む化合物と、ガラス原料とを溶融する溶融工程、溶融工程により得られた溶融物を冷却し、希土類元素のイオンを含むガラス組成物を作製する冷却工程、及び、ガラス組成物を破砕し、粉体を得る破砕工程を、順次、備える。
