To produce a novel catalyst for shift reaction, which is capable of satisfying both of the catalytic activity and durability, and an efficient method for transforming carbon monoxide using the catalyst.

The shift reaction catalyst contains copper, palladium and/or platinum and has an atomic ratio, copper to palladium and/or platinum, of 0.2-20 and in the method for transforming carbon monoxide, carbon monoxide is transformed in the presence of the catalyst.