Abstract: An extendable sunshade for attachment to a garage door comprising a plurality of canopy units and a support frame mounted to the inside face of the garage door for supporting the canopy units. A pair of support rails are disposed on the support frame for slidably engaging with a first canopy unit. Each of the canopy units includes a rectangular body structure having large openings, about which coverings are securely attached and telescopic legs pivotally connected to the corners of the body structure for maintaining the canopy unit in the extended position. Each of the canopy units further includes two external sides on which a plurality of rollers are disposed about for slidably engaging with support rails and two internal sides provided with support rails for slidably engaging with the rollers of an inner canopy unit. The canopy units can be slidably extended from the support frame while the garage door is opened to provide shade over the driveway.