Abstract: Disclosed is a sun shading means for cars mainly including four pieces of sun shades for respectively covering over front, left, rear, and right windows of a car. These sun shades are serially connected by upper and lower independently adjustable elastic fastening belts provided at their adjacent edges. Locating belts are separately connected to lower elastic fastening belts, so that hooks provided at free ends of the locating belts can be hooked onto lower edges of the car's body to firmly locate the whole sun shading means on the car. Two of the lower elastic fastening belts between the front and the left and the right windows pass below two rear view mirrors near two lower outer corners of the front window. Properly adjust the elastic belts shall allow the sun shades to completely and fitly cover windows at all four sides of the car to block all possible gaps through where sun shine may go into the car, and therefore an enhanced heat-insulation effect can be achieved.