The present invention relates to a pad spring for a vehicle brake. To this end, according to an aspect of the present invention, there are provided pad springs for a vehicle brake which are installed in a pad carrier to apply elastic forces in directions in which a pad plate including a brake pad is spaced apart from a disc when an operation of a vehicle brake is released, wherein the pad carrier includes a leading side support frame, a trailing side support frame, an inner side support beam, and an outer side support beam, wherein the support beams connect the support frames, and the pad spring is provided on each of the inner side support beam and the outer side support beam, wherein at least one among a width, a length, and a thickness of a retraction bar provided on one of the pad springs is different from that provided on each of the remaining pad springs so that an elastic force is applied to the pad plate.