PURPOSE: To obtain a quantitative dispenser, wherein the change in dew dropping amount is little.

CONSTITUTION: In the quantitative dispenser, which has a syringe 10 containing liquid agent 11 to be discharged and a control part 20 for supporting the syringe 10 so that the syringe can be attached and removed, a nozzle 14a for discharging the liquid agent 11 provided on the side of the cyringe 10, a valve seat 15 provided on the end part of the nozzle 14a, a valve body 16 which comes into contact and separates from the valve seat 15 to open and close the nozzle 14a and a magnetic attracting means for closing the valve sets the valve body 16 on the valve seat 15 by the magnetic attracting force, are provided. On the side of the control part 20, a fixed magnetic pole which extends inside the syringe 10 with the syringe 10 mounted on the control part 20 and faces the valve body 16, a coil 25 which magnetizes the fixed magnetic pole by the magnetic attracting force stronger than the magnetic attracting force with the magnetic attracting means for closing the valve, and releases the valve body from the valve seat 15, a compressing means which makes the approximately constant discharging pressure act on the liquid surface of the liquid agent 11 contained in the syringe 10, are provided.