A catheter includes a first hollow shaft made of a first material, a second hollow shaft made of a second material, a mesh member with a tubular shape configured to expand and contract in a radial direction, a front end tip, and a core wire. The core wire extends inside the mesh member, inside a lumen of the second hollow shaft, and inside a lumen of the first hollow shaft. The core wire has a front end side small-diameter portion and a large-diameter portion. The large-diameter portion has an outer diameter larger than an outer diameter of the front end side small-diameter portion, and is located on the base end side relative to the front end side small-diameter portion. At least a portion of the large-diameter portion is located in the lumen of the second hollow shaft in a state where the mesh member remains contracted radially.