Disclosed is an automobile bumper which is formed of a thermoplastic multicomponent resin composition and which is improved in weatherability and impact resistance at low temperatures and also in surface glossiness. Essentially the resin composition is a blend of 22-28 wt % of a hydrogenated block copolymer of an aromatic vinyl compound such as styrene and a conjugated diene such as butadiene, 32-56 wt % of a propylene-ethylene block copolymer in which the content of ethylene is 1-10 wt % and 22-28 wt % of an ethylene-propylene copolymer rubber. Optionally, up to 5 wt % of talc and/or up to 7 wt % of low-pressure low-density polyethylene may be added. Some physical properties of the ingredients are specified such that the resin composition has a melt index not lower than 5 g/10 min at 230.degree. C. under load of 2.16 kg and a modulus of elasticity in bending in the range from 2000 to 4000 kg/cm.sup.2.