This invention provides a 2-carbonylthiazole derivative represented by formula (I): ##STR1## wherein each of Ar.sup.1 and Ar.sup.2 represents a phenyl group or a substituted phenyl group; R.sup.1 represents an alkoxy group having 1 to 5 carbon atoms, a hydroxyl group or an amino group; Y.sup.1 --Y.sup.2 represents CH--CO or C.dbd.CR.sup.2, wherein R.sup.2 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms; and n is an integer of from 1 to 4, or a pharmaceutically acceptable salt thereof. The disclosed compounds are useful as drugs for preventing and treating dopamine D receptor-related morbid states such as schizophrenia and problematic behavior caused by cerebrovascular accidents and senile dementia and do not induce extrapyramidal disorders as side effects.