Abstract: A flow amount control apparatus is configured to include a supply tank for storing a liquid, a main pipe having a first open end connected to the tank and a second open end disposed lower than the first end for transferring the liquid from the tank to the second end, a supply valve capable of preventing the liquid from flowing into the main pipe, the supply valve being placed between the tank and the second end, a branch pipe having a third open end connected to the main pipe at a position between the supply valve and the second end and a fourth open end disposed above the third end, a flow amount adjustment means for controlling an amount of the flowing liquid, a liquid level detection unit for detecting a liquid level in the branch pipe, a timer, and a controller for controlling the flow amount adjustment means.