Disclosed herein is a length-reducing syringe driving device, the length-reducing syringe driving device wherein a drive for syringe device is installed at a syringe device (10), and pushes and drives a piston (12) installed at an injection cartridge (11) which has a discharging outlet (13) at one end thereof. The length-reducing syringe driving device (100) comprises: a rotation driving part (110) installed at one or more places at an outer sidewall surface at the other end of the injection cartridge (11) and a one-way bending member (120) provided meet to the piston (12) at one end thereof, configured to be bended exclusively to one direction, and having a sidewall surface of a bending , which provide a predetermined range of an independent rotation of an outer cap (700), driven by the rotation driving part (110) and pushing the piston (12). In the present invention, main elements of the invention are disposed at an outer sidewall surface of an injection cartridge and the entire length (L) of a driving device is remarkably reduced when having the same stroke. Therefore, it is to provide a syringe device which is convenient to be carried and to make syringe devices having many different embodiments possible.
