A liquid delivery system

Provided is a liquid feeding system capable of suppressing generation of air bubbles when feeding a liquid between two tanks connected with a filter device interposed therebetween, and reducing residual liquid in a liquid feeding path. A preparation tank 2, a storage tank 3, a liquid feed path 4, a filter device 5, first pressure adjustment means 6 and second pressure adjustment means 7 capable of adjusting pressure to be applied to the liquid stored in the preparation tank 2 and the storage tank 3, Wherein the first pressure adjusting means 6 and the second pressure adjusting means 7 make the pressure applied to the preparation tank 2 and the pressure applied to the storage tank 3 higher than the atmospheric pressure and control a differential pressure obtained by subtracting the pressure of the storage tank 3 from the pressure of the preparation tank 2 to feed the liquid from...