Holder

A holder comprising:

• a first cover that covers a first part of a corrugated tube in a radial direction of the corrugated tube;
• and
• a second cover engaged with the first cover and that covers a second part of the corrugated tube in the radial direction,
• wherein a first retaining portion is formed on the first cover and is engaged in a groove on a bellows-shaped outer face of the corrugated tube;
• wherein a second retaining portion is formed on the second cover and is engaged in the groove on the bellows-shaped outer face of the corrugated tube;
• wherein the first cover includes a base portion having a substantially flat portion and a pair of side wall portions extending vertically respectively from both a first end and a second end of the base portion;
• wherein the first retaining portion includes a first retaining piece which protrudes and continuously extends from a surface of one of the side wall portions to the substantially flat portion of the base portion and a second retaining piece which protrudes and continuously extends from a surface of the other of the side wall portions to the substantially flat portion of the base portion;
• and
• wherein the first retaining piece and the second retaining piece are separated from each other to form an air gap at the base portion.