Corrugated tube holding structure and electric wire protection component

An electric wire protection component comprising:

• a corrugated tube having annular valley portions and crest portions alternately disposed in a tube axis direction and a slit cut in the tube axis direction, the corrugated tube having a bellows tube shape through which a plurality of electric wires is inserted;
• a housing that accommodates the plurality of electric wires pulled out from a terminal of the corrugated tube, and pulls the plurality of electric wires outward;
• and
• a cover that holds the terminal of the corrugated tube with the housing in an assembled state, and covers the plurality of electric wires pulled out from the terminal of the corrugated tube with the housing in the assembled state, wherein
• the housing and the cover include holding portions that sandwich and hold the terminal of the corrugated tube at an outer peripheral face of the corrugated tube,
• the pair of holding portions includes holding ribs provided with semi-arcuate portions concentrically inserted into the valley portions at the outer peripheral face, the each holding rib being a protrusion protruding from an inner wall face toward the outer peripheral face for each of the plurality of valley portions, and
• one of the holding portions includes a tube expanding protrusion on the inner wall face, the tube expanding protrusion being inserted into the slit in an assembled state and expanding one end and another end of the terminal of the corrugated tube in a circumferential direction viewed from the slit to expand the terminal of the corrugated tube.