A routing method for routing a corrugated tube between a vehicle body of a vehicle and a slide door of the vehicle, the method comprising: providing the corrugated tube comprising a main body portion and a rigid portion having a higher rigidity than the main body portion, the main body portion and the rigid portion being arranged in a longitudinal direction of the corrugated tube, the rigid portion having a first end and a second end, the second end being located between the first end and the main body portion, attaching a vehicle-body-side unit to the rigid portion of the corrugated tube, the vehicle-body-side unit comprising a first attachment member configured to be attached to the rigid portion and a first fixing member configured to support the first attachment member in a rotatable manner, the first fixing member being configured to be fixed to the vehicle body, characterized in that the method further comprises: attaching a door-side unit to the main body portion of the corrugated tube, the door-side unit comprising a second attachment member configured to be attached to the main body portion and a second fixing member configured to support the second attachment member in a rotatable manner, the second fixing member being configured to be fixed to the slide door; and adjusting a distance between the first end of the rigid portion and a position at which the first attachment member is attached to the rigid portion in accordance with the vehicle in which the corrugated tube is routed. providing the corrugated tube comprising a main body portion and a rigid portion having a higher rigidity than the main body portion, the main body portion and the rigid portion being arranged in a longitudinal direction of the corrugated tube, the rigid portion having a first end and a second end, the second end being located between the first end and the main body portion, attaching a vehicle-body-side unit to the rigid portion of the corrugated tube, the vehicle-body-side unit comprising a first attachment member configured to be attached to the rigid portion and a first fixing member configured to support the first attachment member in a rotatable manner, the first fixing member being configured to be fixed to the vehicle body, characterized in that the method further comprises: attaching a door-side unit to the main body portion of the corrugated tube, the door-side unit comprising a second attachment member configured to be attached to the main body portion and a second fixing member configured to support the second attachment member in a rotatable manner, the second fixing member being configured to be fixed to the slide door; and adjusting a distance between the first end of the rigid portion and a position at which the first attachment member is attached to the rigid portion in accordance with the vehicle in which the corrugated tube is routed. attaching a door-side unit to the main body portion of the corrugated tube, the door-side unit comprising a second attachment member configured to be attached to the main body portion and a second fixing member configured to support the second attachment member in a rotatable manner, the second fixing member being configured to be fixed to the slide door; and adjusting a distance between the first end of the rigid portion and a position at which the first attachment member is attached to the rigid portion in accordance with the vehicle in which the corrugated tube is routed.