An object of the invention is to provide a novel sphingosine compound with an inhibitory activity against sphingomyelinase, and a method for producing the sphingosine compound. The novel sphingosine compound or a salt thereof according to the invention is represented by Formula (1): ##STR00001## wherein one of R.sup.1 and R.sup.2 is hydrogen, and the other is a group represented by Formula (G): ##STR00002## wherein n is 0 or 1; and R.sup.3 is hydrogen, C.sub.1-23 alkyl, C.sub.3-8 cycloalkyl, C.sub.2-6 alkenyl, C.sub.1-6 alkoxy, C.sub.3-8 cycloalkyloxy, phenyl, or furil.