An apparatus for fastening the ends of sinusoidal springs or of similar fiat spring elements to a part of a frame of upholstered furniture, includes a long, extended, one-piece plastic profiled strip with a fastening part, continuous over its length, for putting in place staples or similar fastening elements on the frame and in an accommodating part for the sinusoidal springs, which is to face the inner edge of the frame part, with clevis type eyelets for the spring ends, spaced apart in the longitudinal direction of the strip.