Abstract
A clamp device includes an operating rod (20). A protrusion (26) is provided on the outer peripheral surface of the operating rod (20). A cam groove (25) in which the protrusion (26) is accommodated is formed in the inner surface of a housing (1) of the clamp device, the cam groove (25) fixes the operating rod (20) at a position where the operating rod (20) is moved to the leading end side when the operating rod (20) is pressed into the housing (1), and the cam groove (25) allows movement of the operating rod (20) toward the base end side when the operating rod (20) is pressed into the housing (1) again.