RESINOUS TUBE MEMBER, METHOD FOR MANUFACTURING RESINOUS TUBE MEMBER, RESINOUS TUBE FITTING, AND RESINOUS PIPING

A resinous tube member (1) according to the present invention comprises: a tube body (2) having an internal flow path (P) in which a fluid flows; and an outer cylinder (3) that is arranged so as to cover the periphery of at least a body end (2a) of the tube body (2) on an outer peripheral side of the tube body (2), and that is fixed or adhered to the tube body (2). An outer cylinder end (3a) to bewelded to an end of another resinous tube member or a resinous tube fitting is positioned so as to protrude outward in an axis direction (AD) from the body end (2a) on an inner peripheral side thereof, and an inner face step (4) formed by an inner face of the outer cylinder end (3a) and an inner face of the body end (2a) is provided. 本发明的树脂制管构件(1)具有：管本体(2)，其于内部形成有供流体流动的内部流路(P)；及外筒(3)，其于上述管本体(2)的外周侧覆盖该管本体(2)的至少本体端部(2a)的周围而配置，且固定或固着于上述管本体(2)；熔接于其他树脂制管构件或树脂制管接头的端部的外筒端部(3a)较其内周侧的上述本体端部(2a)更向轴线方向(AD)的外侧突出而定位，且设置有由外筒端部(3a)的内面与本体端部(2a)的内面而形成的内面阶差(4)。