A device for regulating liquid medicine supply, comprising: a casing; a body disposed within the casing, and having an inflow inlet through which a liquid medicine from a liquid medicine inflow tube extending to be in communication with a liquid medicine storage space flows into the body, and a discharging outlet for discharging the liquid medicine, which has flowed into the body through the inflow inlet, to a liquid medicine outflow tube; a continuous supply flow passage provided inside the body and configured to regulate a flow rate of the liquid medicine flowing into the body through the inflow inlet so that a certain amount of liquid medicine is continuously supplied to the liquid medicine outflow tube through the discharging outlet of the body; an increment-supplying flow passage (VL1, VL2) configured to divide and store the liquid medicine flowing into the body through the inflow inlet of the body and then to allow the divided and stored liquid medicine to join at an outlet end of the continuous supply flow passage so as to increase the amount of the liquid medicine discharged through the discharging outlet of the body; and an air removal means (224, 225, 225a, 226) provided between the outlet end of the continuous supply flow passage and the discharging outlet of the body and configured to discharge air, which is entrained in the liquid medicine passing through the outlet end of the continuous supply flow passage or is between portions of the liquid medicine passing through the outlet end of the continuous supply flow passage, to the outside of the body so as to remove the air, characterized in that the air removal means (224, 225, 225a, 226) comprises a groove concavely formed on one side of the body so as to allow a portion of the continuous supply flow passage to be in communication with the outside of the body, a cover member coupled to an opening portion of the groove so as to seal the groove, at least one air vent formed in the cover member so as to outwardly discharge air from the liquid medicine passing through the groove in the continuous supply flow passage, and a filter member accommodated between the groove and the cover member so as to allow the air in the liquid medicine introduced into the groove to pass through the filter member and to be discharged through the air vent and not to allow the liquid medicine to pass through the filter member, thereby preventing leakage of the liquid medicine. a casing; a body disposed within the casing, and having an inflow inlet through which a liquid medicine from a liquid medicine inflow tube extending to be in communication with a liquid medicine storage space flows into the body, and a discharging outlet for discharging the liquid medicine, which has flowed into the body through the inflow inlet, to a liquid medicine outflow tube; a continuous supply flow passage provided inside the body and configured to regulate a flow rate of the liquid medicine flowing into the body through the inflow inlet so that a certain amount of liquid medicine is continuously supplied to the liquid medicine outflow tube through the discharging outlet of the body; an increment-supplying flow passage (VL1, VL2) configured to divide and store the liquid medicine flowing into the body through the inflow inlet of the body and then to allow the divided and stored liquid medicine to join at an outlet end of the continuous supply flow passage so as to increase the amount of the liquid medicine discharged through the discharging outlet of the body; and an air removal means (224, 225, 225a, 226) provided between the outlet end of the continuous supply flow passage and the discharging outlet of the body and configured to discharge air, which is entrained in the liquid medicine passing through the outlet end of the continuous supply flow passage or is between portions of the liquid medicine passing through the outlet end of the continuous supply flow passage, to the outside of the body so as to remove the air, characterized in that the air removal means (224, 225, 225a, 226) comprises a groove concavely formed on one side of the body so as to allow a portion of the continuous supply flow passage to be in communication with the outside of the body, a cover member coupled to an opening portion of the groove so as to seal the groove, at least one air vent formed in the cover member so as to outwardly discharge air from the liquid medicine passing through the groove in the continuous supply flow passage, and a filter member accommodated between the groove and the cover member so as to allow the air in the liquid medicine introduced into the groove to pass through the filter member and to be discharged through the air vent and not to allow the liquid medicine to pass through the filter member, thereby preventing leakage of the liquid medicine.