A liquid-jetting apparatus includes: a liquid-jetting head which jets the liquid; a liquid tank which stores the liquid; a first flow passage which connects the liquid-jetting head and the liquid tank; a gas-liquid separating section which is arranged on the first flow passage and which separates the liquid and a gas in the liquid; a gas communication passage which connects the gas-liquid separating section and the liquid tank and through which the gas in the gas-liquid separating section is transported to the liquid tank; a second flow passage which communicates an upstream side and a down stream side of the gas-liquid separating section; and a switching mechanism which selectively switches between a first passage route for supplying the liquid through only the first flow passage and a second passage route for supplying the liquid through the second flow passage.