A lens hood for a camera lens has a mounting barrel and a holding ring. The mounting barrel is hollow, is movably mounted around the camera lens and has an internal surface, a front end, a rear end, a sliding recess and at least one detent. The sliding recess if formed in the internal surface of the mounting barrel and has two ends. The at least one detent is formed adjacent to, communicating with and deeper than the sliding recess; two detents may be formed respectively at the ends of the sliding recess. The holding ring is resilient, is mounted securely around the cameras lens, is mounted in and presses the sliding recess and is selectively mounted in the at least one detent to allow the holding ring to relax and prolong usage lifetime.