A dolly according includes a deck and a plurality of casters extending downward below the deck. A piezoelectric actuator 3 made of a piezoelectric bi-morph device is inserted into the first through-hole 41a and then into the second through-hole 41b from the opposite surface side. The cable has a conductive shield layer surrounding the wires and uniformly spaced apart from the wires An electronic instrument is connected to the first end of the cable and has an illuminator coupled with the optical conduit and a display device connected to the wires.