Disclosed herein is a water saving valve device having a valve body, a coupling unit, a spring, an actuating rod, a push plate, and a packing. A manual manipulating unit is coupled to the coupling unit to manually move the actuating rod up and down, and includes a lower body, a slide bar, a spring, and a locking piece. The lower body is coupled to the coupling unit and has a vertical pipe on its lower portion. The slide bar has on its upper end a magnet, thus vertically moving the actuating rod by magnetic force. The spring is fitted over the lower portion of the slide bar. The upper end of the locking piece is alternately stopped by first and second locking holes when the slide bar moves up and down, and the lower end is supported by the outer circumference of the vertical pipe.