The present invention provides a method of manufacturing a tank having a reinforcement fiber layer, the method comprising: a winding step of winding a fiber impregnated with resin by a predetermined number of windings; and a curing step of thermally curing the impregnating resin in the wound fiber to thereby form the reinforcement fiber layer. In the winding step, an end portion, being a winding end, of the fiber is tucked into an inner fiber layer which has already been wound to thereby insert at least a portion of a fixing region that is a part of the end portion into between fibers forming the outermost layer so that the end portion is fixed to the inner fiber layer.