Microcomponent provided with a cavity delimited by a mechanical cover has improved resistance

This is a microcomponent having a cavity (13) delineated by a cover (12) enclosing an active part (10) supported by a substrate (11). The cover (13) comprises a top wall (12a) having stiffening means with at least one stiffening element projection (12b), said stiffening element (12b) being located between two recessed areas (12c) of the wall apex (12a) and having one end (14) remote from the recess portions (12c) and without contact with the substrate (11).