Manufacturing method of tank

A manufacturing method of a tank, comprising:

• winding a fiber on a liner as a base member of the tank by hoop winding, such as to sequentially form multiple fiber layers of the fiber from a side nearer to an outer circumferential face of the liner toward a side farther from the outer circumferential face of the liner, wherein
• the winding the fiber on the liner comprises:
• forming an (N+1)-th layer that is an (N+1)-th fiber layer from the side nearer to the outer circumferential face of the liner, where N denotes an integral number of not less than 1, such that a position closer to a center of the liner by a first predetermined distance along an axis line direction of the liner from an end in the axis line direction of an N-th layer that is an N-th fiber layer is set to position of an end in the axis line direction of the (N+1)-th layer with respect to a direction perpendicular to the axis line direction;
• and
• winding the fiber on the N-th layer to provide one winding turn of the fiber that is to be included in the (N+1)-th layer, such that a pressing force of pressing the N-th layer in the axis line direction by the fiber is equal to or smaller than a total frictional force in an area in the N-th layer on an edge side in the axis line direction of a fiber winding position.