A catheter has a long axis, a front end and a base end, and includes a first hollow shaft made of metal, a second hollow shaft made of resin, a mesh member with a tubular shape capable of expanding and contracting in a radial direction, a front end tip, and a core wire extending through the mesh member, the second hollow shaft and the first hollow shaft, in which the core wire has a front end side small-diameter portion and a large-diameter portion, the large-diameter portion having an outer diameter larger than an outer diameter of the front end side small-diameter portion, and is located closer to the base end of the catheter relative to the front end side small-diameter portion, and at least a portion of the large-diameter portion is located in a lumen of the second hollow shaft in a state where the mesh member remains contracted radially.
