A catheter which exhibits excellent anti-kinking properties while avoiding interference with respect to an object moving inside the lumen of the catheter includes: an elongated catheter main body having a longitudinally extending lumen； a tubular-shaped guide wire insertion portion on the distal end of the catheter main body through which a guide wire is insertable, and which includes a distal opening portion and a proximal opening portion； and a reinforcement portion having a coil portion in which at least a portion of the reinforcement portion is arranged proximally of the proximal opening portion and is formed by a wound wire element, and an extension portion extending from the wire element of the coil portion in the distal direction away from the proximal opening portion, and wherein the reinforcement portion is positioned between the inner surface and the outer surface of the lumen of the catheter main body.
