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(57) Abstract: Exhaust gas that can improve NOx purification performance in a lean atmosphere where conventional catalysts do not exhibit sufficient activity and can sufficiently exhibit the function as a three-way catalyst A gas purification catalyst and an exhaust gas purification method using the exhaust gas purification catalyst. SOLUTION: A) palladium on a monolithic structure type carrier, Or palladium and rhodium, and b) the following formula (In the formula, 0 <x <1, 0 <α <0.2, 0 ≦ δ ≦ 1, A = Barium and / or potassium, B = at least one selected from the group consisting of iron, cobalt, nickel and manganese) and c) the following formula Ce y Zr 1-y O 2 ( In the formula, the complex II represented by 0 <y <1) is contained. |