Cowl structure for a vehicle

The cowl structure includes: a box-section cross-member (11) under a windshield (2) of the vehicle; an extension member (14) extending frontward from a base wall (13c) of the cross-member (11); and a wiper bracket (16) attached to a front wall of the cross-member (11) and the extension member (14). The base wall (13c) of the cross-member or the extension member is provided with a rigidity changing part (15).