A high tension coil spring structure for a bed mattress comprising: body wiring portions which are disposed regularly at preset distances from each other in the space between an upper edge member and a lower edge member, upper and lower end wiring portions (14, 14') which are provided on both ends of the body wiring portions and set within the range in which the upper and lower edge members (20, 20') are disposed; upper exposed wiring portions which extend from the upper end wiring portions so as to be exposed from the upper edge members; diameter-increasing portions which are provided on the upper end wiring portions and define spaces in which upper exposure start wiring portions of the upper exposed wiring portions move upward and downward while the coil spring structure is being compressed; and means for preventing friction noise which are provided on the upper end wiring portions, wherein the means for preventing friction noise include rigid support ends which are provided on at least one of the body wiring portion and the upper exposed wiring portions, and absorb shock by absorbing a compressive load applied from the upper exposed wiring portions, and the diameter-increasing portions provide spaces in which upper exposure start wiring portions move upward and/or downward while the coil spring structure is being compressed, thereby preventing frictional noise between the upper end wiring portions and the upper exposure start wiring portions, and when a compressive load is applied to the coil spring structure, a plurality of wiring portions formed in the upper exposed wiring portions move upward and downward along the side walls of the rigid support ends, thereby significantly increasing elasticity, characterized in that linear free ends are provided on coil ends of the lower end wiring portions, and are opened without being engaged with wiring portions. body wiring portions which are disposed regularly at preset distances from each other in the space between an upper edge member and a lower edge member, upper and lower end wiring portions (14, 14') which are provided on both ends of the body wiring portions and set within the range in which the upper and lower edge members (20, 20') are disposed; upper exposed wiring portions which extend from the upper end wiring portions so as to be exposed from the upper edge members; diameter-increasing portions which are provided on the upper end wiring portions and define spaces in which upper exposure start wiring portions of the upper exposed wiring portions move upward and downward while the coil spring structure is being compressed; and means for preventing friction noise which are provided on the upper end wiring portions, wherein the means for preventing friction noise include rigid support ends which are provided on at least one of the body wiring portion and the upper exposed wiring portions, and absorb shock by absorbing a compressive load applied from the upper exposed wiring portions, and the diameter-increasing portions provide spaces in which upper exposure start wiring portions move upward and/or downward while the coil spring structure is being compressed, thereby preventing frictional noise between the upper end wiring portions and the upper exposure start wiring portions, and when a compressive load is applied to the coil spring structure, a plurality of wiring portions formed in the upper exposed wiring portions move upward and downward along the side walls of the rigid support ends, thereby significantly increasing elasticity, characterized in that linear free ends are provided on coil ends of the lower end wiring portions, and are opened without being engaged with wiring portions.