CLAMP DEVICE

PROBLEM TO BE SOLVED: To grasp various shape articles in a well-ballanced and stable state without using a jig by installing a pair of hold member which can approach/ separate mutually by plural screw rods and change its posture. SOLUTION: When a first screw rod 20 is only rotated clockwise, a first normal screw bolt nut 23 is moved in a right direction and a first reverse screw bolt nut 25 is moved in a left direction and the front side lower ends of hold members 52, 54 are slanted in a mutually approaching direction and the front side lower ends of the left/right surfaces of article are grasped stably in the case of approaching slant surface. When a second screw rod 29 is only rotated clockwise, a second normal screw bolt nut 31 is moved in a right direction and a second reverse screw bolt nut 33 is moved in a left direction and the opposite side lower ends of hold members 52, 54 are slanted in a mutually approaching direction and the opposite side lower ends of the left/right surfaces of the article are grasped stably in the case of an approaching slant surface.