A medical catheter (10) includes a proximal tube portion (30B) and a distal tube portion (30A), and at least the proximal tube portion is composed of a multilayered structure that includes a metal layer (34) and a resin layer. The proximal tube portion has a metal layer therein, which is at least partly treated, for example physically or chemically, to remove a portion of the metal layer and produce a metal layer having a cross-sectional area which varies in the lengthwise direction.
