To obtain the subject stabilizer not causing discoloration or fading and chalking even in uses outdoors for a long period of time by making the stabilizer include a specific fatty acid metal salt, a specified epoxidized fatty acid metal salt and a prescribed isocyanuric acid derivative.

This stabilizer comprises (A) at least one of 7-14C fatty acid metal salt selected from the group consisting of Zn, Ca, Mg, Ba, Sr, Na and K, (B) at least one of an epoxidized fatty acid metal salt selected from the metal group (preferably an epoxidized stearic acid metal salt) and (C) an isocyanuric acid derivative of the formula (R is H, CH2CH2OH or the like). A chlorine-containing resin composition is obtained by making the composition include a chlorine-containing resin and the stabilizer. A compounding amount the stabilizer is 0.01-5 pts.wt. of the component A and 0.01-5 component B and 0.01-5 pts.wt. of the component C based on 100 pts.wt. of the chlorine-containing resin.