Spring and mattress using same

The utility model relates to a spring and a mattress using the same. An existing torsional spring is poor in lateral toppling resistance. The spring comprises a spring body which is integrally formed, the spring body comprises an upper connecting part and a lower connecting part which are staggered up and down and vertically aligned, two vertical torsion springs are connected between the upper connecting part and the lower connecting part in a bridging mode, the torsion springs are arranged in a split mode, and when the upper connecting part is stressed and vertically gets close to the lower connecting part, the torsion springs are connected with the upper connecting part and the lower connecting part. And the torsional spring is vertically compressed and accumulates pre-tightening force for driving the upper connecting part to reset. The upper connecting part and the lower connecting part are arranged between the top ends and the bottom ends of the two torsion springs correspondingly, the lateral toppling de