A printer, comprising: an ejection head which is configured to eject ink from a nozzle; a recovery tank which is configured to store ink recovered from the ejection head; a buffer part which communicates with the recovery tank; a supply tank which is configured to store ink to be supplied to the ejection head; a first pressure applying part configured to apply a first pressure into the supply tank; a second pressure applying part configured to apply a second pressure which is a negative pressure lower than the first pressure into the recovery tank and the buffer part; a circulation pump which is configured to perform a liquid feed operation of feeding ink from the recovery tank to the supply tank, with supplied electric power; a bypass solenoid valve provided between the supply tank and the recovery tank, which is configured to shut off the supply tank and the recovery tank from each other when energized and causing the supply tank and the recovery tank to communicate with each other when de-energizes; and a power supply part configured to supply electric power to the circulation pump and the bypass solenoid valve, wherein the recovery tank is disposed above the ejection head, and the buffer part communicates with the recovery tank and the supply tank when the bypass solenoid valve is de-energized and causes a third pressure which is a negative pressure higher than the second pressure and lower than the first pressure to be generated in the recovery tank and the supply tank, to thereby prevent leakage of ink from the nozzle with the third pressure resisting a water head pressure between the recovery tank and the supply tank, and the nozzle of the ejection head. an ejection head which is configured to eject ink from a nozzle; a recovery tank which is configured to store ink recovered from the ejection head; a buffer part which communicates with the recovery tank; a supply tank which is configured to store ink to be supplied to the ejection head; a first pressure applying part configured to apply a first pressure into the supply tank; a second pressure applying part configured to apply a second pressure which is a negative pressure lower than the first pressure into the recovery tank and the buffer part; a circulation pump which is configured to perform a liquid feed operation of feeding ink from the recovery tank to the supply tank, with supplied electric power; a bypass solenoid valve provided between the supply tank and the recovery tank, which is configured to shut off the supply tank and the recovery tank from each other when energized and causing the supply tank and the recovery tank to communicate with each other when de-energizes; and a power supply part configured to supply electric power to the circulation pump and the bypass solenoid valve, wherein the recovery tank is disposed above the ejection head, and the buffer part communicates with the recovery tank and the supply tank when the bypass solenoid valve is de-energized and causes a third pressure which is a negative pressure higher than the second pressure and lower than the first pressure to be generated in the recovery tank and the supply tank, to thereby prevent leakage of ink from the nozzle with the third pressure resisting a water head pressure between the recovery tank and the supply tank, and the nozzle of the ejection head.