A catheter is provided, which includes a tube including a first portion, a second portion connected to the first portion and having a less rigidity than the first portion, and a plurality of holes longitudinally penetrating the first portion and the second portion and being isolated from one another, a wire passing through two of the plurality of holes of the tube, and a cap being engaged with an extrusion portion of the wire extruded from the two holes of the tube in a manner of enclosing the extrusion of the wire, being connected to one end of the tube, and having a greater rigidity than the first portion and the second portion of the tube.
