A galactosamine derivative represented by the following formula (1): <；CHEM>； wherein R1, R2 and R5 each independently represents SO3<；->； or H, and at least one of them represents SO3<；->；； R3 represents H, acetyl or SO3<；->；； R4 represents H, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted acyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group； X represents O, S, NH or CH2； and Ð represents an alpha bond or a beta bond, and a sulfotransferase inhibitor comprising the derivative. <；IMAGE>；
