A catheter (10) includes a flexible tube-shaped main catheter body (12), a hub (14) connected to a proximal portion (12b) of the main catheter body (12), and a strain relief (16) supported by a distal portion of the hub (14), the strain relief (16) surrounding a predetermined range of a proximal side of the main catheter body (12). The strain relief (16) includes a hard portion (32) which is provided in each of regions opposite from each other with respect to an axis (a) in at least a distal-side portion, and which is configured to be harder than another portion (34) in a circumferential direction.
