This invention provides various kinds of engaging devices made of thermoplastic resin material which has an excellent productivity and secures an easiness in handling upon engagement or disengagement and in which breaking of hook element at each end is prevented and the hook element is never pierced into the finger. More specifically, the invention provides an engaging device having a plurality of hook elements disposed in plural rows on a surface of a substrate so as to engage with an engaging portion of a mating member having a plurality of loop elements on a surface thereof. Projections risen substantially vertically from a surface of the substrate are formed integrally therewith so as to secure protection function and backup function.