A liquid dispensing pump, which can effectively prevent coil spring corrosion and elution, is described. This liquid dispensing pump is used for dispensing a liquid stored inside a liquid-storing unit from a nozzle head by pressing down said nozzle head provided over the liquid-storing unit. This liquid dispensing pump possesses a cylinder provided on top of the liquid-storing unit, a piston which can move reciprocally inside the cylinder, a coupling tube for lowering the piston by transmitting pressure applied to the nozzle head by connecting the nozzle head with the piston, a coil spring provided at the peripheral portion of the coupling tube for increasing momentum given to the piston in its ascending direction, an inlet valve for bringing a liquid stored in the liquid-storing unit into the cylinder with the ascending motion of the piston, and an outlet valve mechanism for moving the liquid brought inside the cylinder out to the nozzle head via the coupling tube with the descending motion of the piston.