A lever assembly includes a lever and a fastener for pivotally mounting the lever to a fixed support member. The lever is composed of a lever body made of a plastic and a reinforcement plate assembled with the plastic lever body. The lever body has a first groove formed in one surface of the lever body and extending from a central through-hole to a position in proximity of a mount hole formed at one end of the lever body, and a second groove formed in the opposite surface of the lever body and extending from the central through-hole to a position in proximity of the other end of the lever body. The reinforcement plate is fitted in the first and second grooves across the central through-hole of the lever body. The fastener comprised of a screw with flanged head has a portion lying over part of the reinforcement plate to prevent the reinforcement plate from displacing off the lever body.