A liquid supply apparatus includes: a storing tank configured to store a liquid; a supply conduit through which the liquid remained inside the supply conduit flows reversely into the storing tank by a predetermined amount over time, the supply conduit having a first end portion connected to the storing tank; a liquid feeding section which is arranged at the storing tank or the supply conduit, and which is configured to feed the liquid from the storing tank to a second end portion of the supply conduit; a time measuring section which measures an elapsed time from stop of the liquid feeding by the liquid feeding section; and a control section which is connected to the liquid feeding section and the time measuring section and which is configured to drive the liquid feeding section for a predetermined time based on a length of the elapsed time.