Provided is a uracil compound or a salt thereof, which has potent human dUTPase inhibitory activity and is useful as, for example, an antitumor drug. A uracil compound represented by the general formula (I) or a salt thereof: wherein n represents an integer of 1 to 3； X represents a bond, an oxygen atom, a sulfur atom, or the like； Y represents a linear or branched alkylene group having 1 to 8 carbon atoms, or the like； and Z represents -SO 2 NR 1 R 2 or -NR 3 SO 2 -R 4 , wherein R 1 and R 2 each represent an alkyl group having 1 to 6 carbon atoms, an aralkyl group which is optionally substituted, or the like； R 3 represents an alkyl group having 1 to 6 carbon atoms, or the like； and R 4 represents an aromatic hydrocarbon group, an unsaturated heterocyclic group, or the like.
