A hand according to an embodiment includes a pair of supporting units, a pair of capturing claws, an opening-and-closing mechanism, and a reciprocating mechanism. The pair of capturing claws are supported on the inner surfaces of the pair of respective supporting units and capture a part. The opening-and-closing mechanism opens and closes the pair of supporting units along a reciprocating axis intersecting with longitudinal directions of the supporting units. The reciprocating mechanism causes the pair of capturing claws to rotate about the reciprocating axis to change the direction of each tip of the capturing claws.