The purpose of the present invention is to provide a medical device in which a sub-tube into which an operating wire is inserted can be fixed to a tubular shape, without separation. The catheter (100) of the present invention is provided with a long tubular body (10), the operating wire (60), and an operating unit (90). The tubular body (10) includes: a long inner layer (24) that demarcates a main tubular cavity (20)； a wire-reinforced layer (30) formed around the inner layer (24) by coiled reinforcing wire (32)； the resin sub-tube (40) that is positioned on the outside of the wire-reinforced layer (30) so as to extend along the length direction of the main tubular cavity (20), and demarcates a sub-tubular cavity (42) having a smaller diameter than the main tubular cavity (20)； a resin outer layer (50) that envelopes the wire-reinforced layer (30) and the sub-tube (40)； and a supporting wire (70). The operating wire (60) is passed through the inside of the sub-tubular cavity (42) such that movement is possible, and the tip is connected to a distal part of the tubular body (10). The support wire (70) is enveloped by the outer layer (50) and is wound around both the sub-tube (40) and the wire-reinforced layer (30). The support wire (70) is fitted to the outer-radial side peripheral surface of the sub-tube.
