A piezoelectric print head includes a piezoelectric element; a nozzle that ejects liquid when the piezoelectric element is driven; a transmission gate that switches between supply and non-supply of a driving signal for driving the piezoelectric element to the piezoelectric element; a history-information memory that holds history information indicating history of ON or OFF of the transmission gate; and a switch-operation stop controller that stops a switch operation that causes the transmission gate to be turned OFF from ON or to be turned ON from OFF, in accordance with the history information.