PURPOSE: To eliminate inconvenience caused by the opened width of the head end of a pair of tweezers not matching the size of held objective where pairs of tweezers on the market were previously used.

CONSTITUTION: By turning a screw turning part 5 to the right or to the left, a screw part 6 of the screw turning part 5 turns, and a tweezers movable part 2 fixed on a nut part 7 connected to it is moved to the left or to the right. Consequently, it is possible to continuously adjust a space between a tweezers fixing part 1 and the tweezers movable part 2, that is, the opened width of the tweezers head end. Consequently, an objective always becomes graspable by force pushing a pair of tweezers so that working efficiency is improved. Additionally, no resiliency within elasticity limit of the tweezers is not applied to the objective, and the objective is always graspable with adjustable force.