A catheter (10) includes a proximal shaft (20), a distal shaft (30) including a proximal end portion (32) having an inner cavity into which a distal end portion (21) of the proximal shaft (20) is fitted, and a core wire (40) extending through the inner cavity of the distal shaft (30). The core wire (40) has a proximal end portion (42) that is joined to a cutout portion (23) formed in the distal end portion (21) of the proximal shaft (20). Joining means (50) is formed along a joint surface (51) between the proximal end portion of the core wire (40) and the cutout portion (23). When the joining means (50) is divided into first joining means (52) and second joining means (53) along a longitudinal axis (L) of the catheter (10), a length of one of the first joining means (52) and the second joining means (53) is larger than a length of the other of the first joining means (52) and the second joining means (53).
