A constant volume delivery device capable of easily adjusting the discharge rate of powder material stored in a tubular body to a desired discharge rate and discharging the powder material stably at a constant volume rate, comprising the tubular body (2) storing the powder material and an elastic body film (Et) provided so as to form the bottom surface of the tubular body (2) and having a plurality of through-holes (hs ...), wherein the elastic body film (Et) is vibrated using a positive pressure pulsating aerial vibration wave so as to discharge the powder material stored in the tubular body (2) through the plurality of through-holes (hs ...) provided in the elastic body film (Et), the plurality of through-holes (hs ...) provided in the elastic body film (Et) being provided on the circumference of a circle (Ci) with a center (Pc) on the elastic body film (Et).