[Problems to be Solved] An object of the present invention is to provide a catheter and a balloon catheter in which an outer layer does not readily come off an inner layer when the outer layer is pulled in the axial direction (in the distal end direction and in the proximal end direction) or in the radial direction (outwardly).[Solution] In a catheter 1, in a gap 25 of a reinforcing layer (coil body) 30, disposed is a first bonding portion 50 where a first inner layer protruding portion 12 of an inner layer 10 sticking into a first outer layer 40 is engaged with a first outer layer protruding portion 42 of the first outer layer 40 sticking into the inner layer 10. This configuration enlarges the area across which the first outer layer 40 and the inner layer 10 are bonded to each other within the gap 25 of the reinforcing layer (coil body) 30, leading to a strengthened bond between the first outer layer 40 and the inner layer 10. The first bonding portion 50 is anchored in the reinforcing layer (coil body) 30 to produce an anchoring effect, which can reduce the probability of the first outer layer 40 to come off the inner layer 10 when the catheter 1 bends to cause the first outer layer 40 to be pulled in the axial direction (in the distal end direction and in the proximal end direction).
