[Problem] To provide a catheter, wherein the visibility of the most distal end of the catheter under radioscopy can be improved while ensuring the safety of the catheter. [Solution] This catheter 100 has: a tubular shaft part 110 having a tip section 110d formed of a resin; and an annular marker part 120 disposed at the tip section of the shaft part and formed of a radiopaque metal. The tip section of the shaft part has: a tapered portion 111; and a constant-outer-diameter portion disposed closer to the base end side than the tapered portion. The marker part has: a marker tip section 121 disposed on the tapered portion so as to follow the outer shape of the tapered portion; and a marker base end section 125 disposed on the constant-outer-diameter portion. A first region A1, which is formed by the tapered portion and the marker tip section, has a higher resin content per unit volume than a second region A2, which is formed by the constant-outer-diameter portion and the marker base end section.