Clamping device

A clamping device 3 has a base body 4, a pressing body 5 for pressing a workpiece 2 and a rotary body 6 operated to rotate, all of which are rotatable relative to each other about an axis 7. The pressing body 5 can rotate between a first rotary position at which the pressing body 5 does not face the workpiece 2 and a second rotary position at which the pressing body 5 faces the workpiece 2. The pressing body 5 can move between a press releasing position and a pressing position while being at the second rotary position. When the rotary body 6 is rotated from one rotary position to a middle rotary position, the pressing body 5 rotates from the first rotary position to the second rotary position as the rotary body 6 rotates. When the rotary body 6 is rotated to another rotary position, the pressing body 5 is moved from the press releasing position to the pressing position by a cam mechanism 141. In this connection, the cam mechanism 141 is configured in such a manner that a cam surface(s) 142 and a contact section(s) 143 thereof have surface contact with each other.