A stencil discharge apparatus for a stencil printing machine has a discharge box for storing a predetermined amount of stencil sheets after being peeled off from a printing drum so as to discharge the stencil sheets. The stator yoke is fitted into and fixed to a coil bobbin, a base plate, or a sheet metal having a concave portion formed therein. The inertial valve does not open in response to rider-induced forces and prevents communication of the fluid compressed by the piston from the first fluid chamber to the second fluid chamber.