A method of forming a cylindrical member by transporting a belt-like member (8a, 8b) placed on a transport conveyor belt to a forming drum and winding the belt-like member (8a, 8b) around the forming drum to form the belt-like member (8a, 8b) in a cylindrical shape, the method comprising the steps of: detecting a position of a member reference line by a pre-winding position sensor before winding the belt-like member around the forming drum, the member reference line extending in a longitudinal direction of the belt-like member along the entire length of the belt-like member in the longitudinal direction thereof; and forming the belt-like member in a cylindrical shape by winding the belt-like member around the forming drum while the forming drum is relatively moved in a drum width direction with respect to the transport conveyor belt by a controller and the member reference line and a drum reference line are matched, on the basis of data detected by the pre-winding position sensor and position data of the drum reference line orthogonal to a drum axial center of the forming drum and set in a predetermined position in the drum width direction, wherein, when another belt-like member is laminated and wound around an outer peripheral surface of the cylindrical member to form the other belt-like member in a cylindrical shape, the pre-winding position sensor detects a position of a member reference line before winding the other belt-like member around the outer peripheral surface of the cylindrical member, the member reference line extending in a longitudinal direction of the other belt-like member along the entire length of the other belt-like member in the longitudinal direction thereof; and the other belt-like member is wound while the forming drum is relatively moved in the drum width direction with respect to the transport conveyor belt by the controller and the member reference line drawn on the other belt-like member and the member reference line drawn on the cylindrical member are matched, on the basis of detection data of the other belt-like member by the pre-winding position sensor and position data of the member reference line drawn on the cylindrical member. detecting a position of a member reference line by a pre-winding position sensor before winding the belt-like member around the forming drum, the member reference line extending in a longitudinal direction of the belt-like member along the entire length of the belt-like member in the longitudinal direction thereof; and forming the belt-like member in a cylindrical shape by winding the belt-like member around the forming drum while the forming drum is relatively moved in a drum width direction with respect to the transport conveyor belt by a controller and the member reference line and a drum reference line are matched, on the basis of data detected by the pre-winding position sensor and position data of the drum reference line orthogonal to a drum axial center of the forming drum and set in a predetermined position in the drum width direction, wherein, when another belt-like member is laminated and wound around an outer peripheral surface of the cylindrical member to form the other belt-like member in a cylindrical shape, the pre-winding position sensor detects a position of a member reference line before winding the other belt-like member around the outer peripheral surface of the cylindrical member, the member reference line extending in a longitudinal direction of the other belt-like member along the entire length of the other belt-like member in the longitudinal direction thereof; and the other belt-like member is wound while the forming drum is relatively moved in the drum width direction with respect to the transport conveyor belt by the controller and the member reference line drawn on the other belt-like member and the member reference line drawn on the cylindrical member are matched, on the basis of detection data of the other belt-like member by the pre-winding position sensor and position data of the member reference line drawn on the cylindrical member.