FIXED VOLUME LIQUID FEEDER

PROBLEM TO BE SOLVED: To feed a liquid of fixed volume by a simple mechanism without using any electric method. SOLUTION: A fixed volume liquid feeder comprises a liquid storage vessel 1, a liquid reception vessel 3, and a water level detection vessel 2, the liquid storage vessel 1 is set to communicate with the liquid reception vessel 3 via a liquid conduit 4, and the liquid storage vessel 1 is arranged to communicate with the water level detection vessel 2 via an air-liquid conducting member 8. The air-liquid conducting member 8 has an air flow passage 8a and a liquid flow passage 8b, and a lower end opening part of the liquid flow passage 8a is located at the position higher than the lower end opening part of the liquid flow passage 8b. An atmosphere communication pipe 7 is put in the water level detection vessel 2.