Method for producing high-pressure tank

A method for producing a high-pressure tank by forming a fiber-reinforced resin layer having a plurality of sequentially stacked reinforcement layers by winding resin-impregnated fiber bundles around an outer periphery of a tank liner having a storage space while rotating the tank liner about a shaft center of the tank liner in one direction,

• wherein:
• each reinforcement layer is formed by winding the fiber bundles while holding a preset tension for each reinforcement layer,
• the method comprising:
• a winding start step of stopping rotation of the tank liner upon completion of formation of at least one reinforcement layer of the plurality of reinforcement layers, and, at a start of forming a following reinforcement layer, winding the fiber bundles around the at least one reinforcement layer at a tension that is smaller than a preset tension for the following reinforcement layer while alternately repeating rotation of the tank liner in the one direction and a reverse direction thereof, thereby forming a winding start portion of the following reinforcement layer;
• and
• a main winding step of winding the fiber bundles at the preset tension after the winding start step, so as to complete the formation of the following reinforcement layer.