PURPOSE: To provide a robot hand which can store any printed board even with warp surely without difficulty concerning the robot hand of an automated material handling device which stores in and takes out a lot of printed boards on which parts are mounted to/from a prescribed position of a storage rack.

CONSTITUTION: A robot hand comprises a sandwiching part 2 in which claw members 1 with recessed and hook-shaped tips are arranged facing each other so as to sandwich both ends of the front part of a printed board 9 and which advances/retreats along a fixed distance in both direction, and roller sandwiching part 5 which allows pluralilty of guide rollers 3 with recessed contact parts to face thereto so as to apply elastic pressure, movably sandwiches both ends of the printed board 9, and makes contact with the outer faces of the claw members 1 of the sandwiching part 2 so as to expand or recover to its original state freely, arranged on a flat base 4.