To provide a mechanical handling device for a working piece of one hand operation type capable operating with one hand only.

A pincers member 1 has a spacer 11, as a drive end 9, directed toward a ram part 27 together with a tension spring 19, the tension spring 19 can hold the spacer 11 outside an advancing stroke route of the ram part 27. Drive elements 22, 23, in which the spacer is turned against elastic force of the tension spring 19, its drive end 9 and a drive end 10 of the ram part are held so as to be positioned apart in an advancing stroke of the ram part 27 for a pincers member 2 further, working ends 7, 8 are abutted on a turnable drive element 24 moving up to reach a closed position, are arranged to the spacer. The drive element 24 has a protrusion 40 to move a switch 30 in order to start a working stroke when reaching a closed position.