PURPOSE: To facilitate teaching operation of robot and contrive lowering of cost in operation stage constitution, by combining a fixing bracket, mobile bracket, cutting tool, holding tool and driving means so as to carry out specific action.

CONSTITUTION: The aimed mechanical hand H is equipped with a fixing bracket 20 fixed to a hand supporting part 4a, mobile bracket 30 inclinably attached to the fixing bracket 20, cutting tool 40 provided to the mobile bracket 30 and cutting curved sheet glass 1 to prescribed shape, holding tool 50 for catching the curved sheet glass 1 in cutting action by cutting tool 40 and driving device 60 for driving mobile bracket 30. When peripheral area of the curved glass 1 is cut with an industrial robot R using the mechanical hand, cutting point of the mechanical hand H is moved along cutting line forming track of the curved sheet glass 1 and simultaneously the cutting tool 40 is preferably inclined according to an angle of inclination in the curved radius direction of cutting line forming part 1a of the curved sheet glass 1.