To provide a double layered structural woven fabric simultaneously having permeation-preventing properties and air-permeable properties; and to provide a fiber product obtained by sewing the double layered structural woven fabric.

Each layer of the double layered structural woven fabric has a woven structure. The cover factor CF of each of the layer is mutually different and is regulated so that the cover factor CF1 of the layer at the high CF side is within a range of 1,000-2,500, and the cover factor CF2 of the layer at the low CF side is within a range of 150-1,600. The double layered fabric is obtained by sewing the structural woven fabrics having the CF1 and the CF2 satisfying the formula: 0.05≤[(CF2)/(CF1+CF2)]≤0.45 so that the layer at the low CF side may be positioned at the inside.