An elastic leg disposable diaper (10) comprises elastic strips (16) extending and being secured to the diaper continuously along the full length of the outside longitudinal edges of the diaper. These elastic strips are secured in the crotch area (C) of the diaper in stretched elastically-contractible condition forming gathered and extendible side portions (P) in the crotch area for elastic conformance of such side portions with the legs of the wearer. The process and apparatus for attaching such elastic strips (16) in the diapers includes alternately stretching and relaxing predetermined lengths of the elastic strips during feeding thereof for adhering the stretched lengths (S) to the crotch area (C) and the more relaxed lengths (R) to the eaist areas (W) of each diaper.
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