To provide a three-dimensional network structure having good body pressure-dispersing properties even when the three-dimensional network structure 1 is formed so as to have a thin thickness, hardly causing bottoming, produced in good productivity at a low production cost; and to provide a method for producing the three-dimensional network structure.

The three-dimensional network structure obtained by three-dimensional irregular entanglement of many wires 3 made from a resin, and partial fusing thereof is regulated so that the three-dimensional network structure may be gradually harder from the front surface 8 side at the use to the back surface 9 side. The method for producing the three-dimensional network structure 1 obtained by three-dimensional irregular entanglement of the many wires 3 made from the resin and having elasticity, and partial fusing thereof comprises changing the intervals and/or diameters of many holes 12 formed in a nozzle 11 so as to correspond to the front and back surface direction and/or the direction orthogonal to the front and back surface direction, extruding the resin from the many holes 12 of the nozzle 11 to form the wires 3, and to provide the three-dimensional network structure 1 regulated so that the hardness in the front and back surface direction and/or the direction orthogonal to the front and back surface direction may be changed.