Abstract: A small sized, low cost plate conveyance robot includes first and second driving motors on first and second link mechanisms respectively. The rotation angles of three driving motors are simultaneously and sequentially controlled to allow the third arm to make a rectilinear motion by a predetermined distance L in a fixed direction in a horizontal plane in order to take a plate material to be conveyed into the suction hand portion of the third arm as well as to take out the plate from the suction hand portion of the third arm after finishing the given conveyance operation.