A retention member (100) includes a seat (1), a locking member (2) and a protecting member (22) assembled on the seat (1), the locking member (2) can rotate to be released and has a body portion (20), the protecting member (22) has an enwrapping portion (220) locating on an outer side of the body portion (20) of the locking member (2), a pair of retention portions (221) extending from opposite ends of the enwrapping portion (220), the retention portions (221) are initially resisted by the seat (1) to limit the rotation of the protecting member (22) and the locking member (2), the retention portions (221) also can be raised to break away from the resisting of the seat (1) and the locking member (2) then can be rotated to be released.