A percutaneous catheter provides an adjustable diameter in order to reduce pressure loss, maintain a required flow, and avoid increasing a load to the patient. A catheter tube is formed of braided wires in an intersecting manner and extends in an axial direction. A distal tip is affixed to a distal side of the catheter tube and is configured to engaged a distal end of a dilator. The catheter tube includes a non-coated portion on a proximal side of the distal tip and a coated portion embedded in a resin material. An inner diameter of the non-coated portion is larger than an outer diameter of the dilator. When the dilator is fully inserted through the percutaneous catheter, the non-coated portion expands in the axial direction, reducing its in inner diameter so that an inner surface of the non-coated portion comes into tight contact with an outer surface of the dilator.