Novel 4-aroylimidazol-2-ones of the following general structure which are useful as antihypertensives, cardiotonics, antithrombotics, bronchodilators and uterospasmolytics ##STR1## wherein Ar is 2-furyl, 2-thienyl or phenyl, the latter of which may optionally be substituted with one or two X groups; X is halogen, hydroxy, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, methylenedioxy, C.sub.1-4 alkylthio, C.sub.1-4 alkylsulfoxide, C.sub.1-4 alkylsulfone, CF.sub.3, --SO.sub.2 N(R.sub.2).sub.2, NR.sub.3 R.sub.4, pyrrolidino, piperidino, morpholino, piperazino or N'-alkyl-piperazino, R is hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkylcarbonyl or benzyl; each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hydrogen or C.sub.1-4 alkyl; and the pharmaceutically acceptable salts thereof.