Provided is a catheter which is excellent in flexibility to follow a guidewire and is not easily kinked even when the catheter is bent strongly. A catheter shaft 3 comprises a hollow inner layer 2 and an outer layer 5, and a wire 7a wound to form a hollow screw shape within the hollow inner layer 2 and the outer layer 5, wherein the wire 7a is slidable with respect to the inner layer 2 and the outer layer 5.
