Catheter device for medical

The present invention is a catheter apparatus comprising a sheath (1) which the catheter is inserted and the catheter (2). Catheter extension distal end insertion guide member (5) is attached to the balloon (3) is provided to diameter of the stent for vascular (4) distally, expanding medium for expanding the balloon is supplied medium supply passage (7) is formed. The sheath is relatively moved manipulation on the catheter over between a position for exposing position and vascular stents mounted on balloon cover the balloon stent for vascular is attached to the outside. Between the sheath and the catheter, the distal end side of the sheath to restrict the first movement restricting portion for restricting the protrusion of the distal end side of the catheter (35), the projection amount of protruding the tip side of the catheter outward 2 movement restricting portion (40) and is provided, by restricting the relative movement position relative to the catheter sheath, for regulating the excessive movement of the sheath.