A lightweight cowl crossbar includes: a first cowl crossbeam located on a first side frame disposed at a first side of a vehicle body; a second cowl crossbeam fastened to the first cowl crossbeam and fixed to a second side frame disposed at a second side of the vehicle body; a support leg located on the second cowl crossbeam and configured to be supported by the vehicle body, and a drawing block part located on a region where the first cowl crossbeam and the second cowl crossbeam overlap.