<p>A robot includes a robot arm. A robot hand is disposed at a distal end of the robot arm and grips an object. The robot hand includes an air chuck device including a pair of pistons and an air cylinder. The air cylinder opens and closes the pistons in parallel to one another. A pair of first gripping members are disposed at a first side of the pistons and move close to and apart from one another within a first movable range on a movable plane. A pair of second gripping members are disposed at a second side of the pistons and move close to and apart from one another within a second movable range different from the first movable range on the movable plane. The robot hand pivots relative to the distal end of the robot arm about a pivot axis approximately perpendicular to the movable plane.</p>
