Patent ID: 7763137

Claim:
A manufacturing method of the high-pressure tank provided with a pressure shell which is formed by winding reinforcement fibers provided with resin material for hardening on an outer surface of an hollow tank base body, comprising: filling fluid under pressure regulation in an inside of the tank base body, forming a lowermost fiber layer of the reinforcement fibers on the tank base body while applying pressure to the fluid under pressure regulation to a given pressure and the reinforcement fibers are wound around the tank base body while applying a given tension to the reinforcement fibers, laminating second fiber layers over the lowermost fiber layer to form upper fiber layers, the second fiber layers being laminated in multiple layers in a state that the pressure applied to the fluid under pressure regulation is gradually decreased corresponding to a number of laminated layers of the second fiber layers, and the given tension applied to the reinforcement fibers of the second fiber layers is gradually increased corresponding to the number of laminated layers of the second fiber layers thus forming the pressure shell, and emptying the inside of the tank base body such that a compressive force is applied to the lowermost fiber layers and, simultaneously, a tensile force is applied to the upper fiber layers.