An aromatic polysulfone resin composition improved in dispersibility of fluorocarbon polymer comprising 0.3 to 50 parts by weight of a low molecular weight fluorocarbon polymer fluorinated up to its molecular end, having a flow temperature of 350.degree. C. or lower as measured by the following method, and 100 parts by weight of an aromatic polysulfone resin:Flow temperature: A temperature at which melt viscosity reaches 48,000 poises when a molten sample is extruded from a nozzle (1 mm in inner diameter and 10 mm in length) of a capillary rheometer under a load of 100 kg/cm.sup.2 at a temperature elevation speed of 4.degree. C./minute.