Physicochemical properties of Ca-homopantothenate was investigated. It is easily soluble in water, but insoluble in organic solvents, only slightly soluble in methanol. Apparent dissociation constants obtained by titration curve was 4.52. Rf is 0.86,when a developing solvent con-sisted of n-buthanol・acetic acid・water is used, by the thin layer chromatography. Infrared absorption spectrum was supported its structure. Ultraviolet absorption spectrum of its aqueous solution has no peak above 2O0mμ. Stability of its aqueous solution on pH profile was estimated by the kinetic technique. The most stable pH ranges were 5.0〜6.0.