Proposed is a phosphor which has improved water resistance, and whereby it becomes possible to effectively prevent the occurrence of adverse influence of a sulfur-containing gas and therefore effectively prevent the corrosion of a metallic member. A phosphor is proposed, which comprises: a sulfur-containing phosphor in which sulfur is contained in a matrix thereof; and particles or a layer which are or is provided on the surface of the phosphor and comprise or comprises a crystalline metal borate containing a IIA-Group element, boron and oxygen.
