There is provided a flexible tube for an endoscope, including a framed structure unit having a plurality of joint members rotatably coupled to each other so that the framed structure unit is able to bend freely, each joint member having a form of a short cylinder, a reticulated tube that is reticulated with thread and is formed to cover the framed structure unit, and a flexible sheath that has flexibility and is formed to cover the reticulated tube. Further, a cross section of an outer surface of the flexible sheath has a circular shape, and a cross section of an outer surface of each joint member has a non-circular shape so that a wall thickness of the flexible sheath has a thicker part in a particular direction about an axis line of the flexible tube than another part of the wall thickness of the flexible sheath.
