A catheter includes a proximal shaft, a distal shaft including a proximal end portion having an inner cavity into which a distal end portion of the proximal shaft is fitted, and a core wire extending through the inner cavity of the distal shaft. The core wire has a proximal end portion that is joined to a cutout portion formed in the distal end portion of the proximal shaft. Joining means are formed along a joint surface between the proximal end portion of the core wire and the cutout portion. When the joining means are divided into first joining means and second joining means along a longitudinal axis of the catheter, a length of one of the first joining means and the second joining means is larger than a length of the other of the first joining means and the second joining means.