The present invention is a gripper comprising a motor 12 for driving a connecting nut 126 that is translated, a gripping finger 103 having at least two sides of substantial V shape and a shared portion 103g for joining one ends of the two sides, and provided with the other ends of the sides, a base member 110 with a notch 110c for engaging the other end portion of the gripping member 103, a holder member 145 having a groove 145e for engaging the base member 110 detachably and the hollow portions 145m and 145h that are penetrated, and a magnetic member 128 composed of a permanent magnet inserted into the hollow portions 145m and 145h of the holder member 145, with one end connected to the connecting nut 126, and the other end magnetically connected to the shared portion 103g of the gripping finger 103.

 
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