The contents of sterols in bean sprouts have been determined by mass spectrical analysis. From non-saponifiable fraction of n-Hexane extracts of the under ground parts sterol-like substance $(m.P.;142-145^{circ}C)$ was isolated. It was shown to be a sterol mixture on the basis of three peaks in gas liquid chromatogram. By mass spectrometrical analysis of the mixture, it was composed of 4.52mg% of Campesterol $(C_{28},;{Delta}^{5})$, 10.35mg% of ${eta}-sitosterol;(C_{29},;{Delta}^{5})$ and 7.75mg% of stigmasterol $(C_{29},;{Delta}^{5,;22})$.