Rubber-cord complex 9 having improved wet heat adhesive property between rubber and cord. The rubber-cord complex includes cord 10 comprising drawn plated wire 17 prepared by providing brass plated layer 16E on surface of element wire 15 and drawing the resulting plated wire and rubber 12 vulcanized and bonded to cord 10. The rubber-cord complex 9 has adhesion reaction layer 25 (formed by cross-linking sulfur and copper) between rubber 12 and brass plated layer 16E. Adhesion reaction layer 25 has average thickness of 50-1,000 nm. Interface S between adhesion reaction layer 25 and the rubber has a fractal dimension of 1.001-1.300 in a wet heat deterioration state after being subjected to vulcanization to bond rubber 12 thereto and being held at a temperature of 50-100° C. and a humidity of 60-100% for one hour to 20 days.