A car sunshade includes: a pair of curtain members each hung to a hanger and operatively driven by a driving device to be upwardly unwound for shielding the windshield of the car from being exposed to sun light along a pair of guiding devices respectively mounted on (or juxtapositioned to) two pillars adjacent to the windshield; or the curtain members being downwardly wound to unveil the windshield of the car, without removing a factory-installed rear-view mirror and without obstructing a driver's head.