An ink jet head, comprising: a pressure chamber accommodating liquid; an actuator configured to change a volume of the pressure chamber in accordance with a drive signal applied to the actuator; and an application unit configured to apply the drive signal to the actuator, the drive signal including: a first discharge pulse that causes liquid to be discharged from a nozzle communicating with the pressure chamber; a second discharge pulse that is applied after the first discharge pulse and causes liquid to be discharged from the nozzle communicating with the pressure chamber; and a vibration pulse that is applied before the first discharge pulse and has a potential difference having a polarity opposite to that of the first discharge pulse and the second discharge pulse, and causes a pressure vibration to be generated in the liquid to promote discharge of the liquid during at least one of the first discharge pulse and second discharge pulse, characterized in that the application unit is further configured such that a period between a center of the first discharge pulse and a center of the second discharge pulse is 1.5 times to 2.5 times a half-period of a main acoustic resonance frequency of the liquid in the pressure chamber, and a pulse width (dpA) of the first discharge pulse is closer to the half-period of the main acoustic resonance frequency than a pulse width (dpB) of the second discharge pulse, the pulse width of the first discharge pulse being a sum of a time in which a voltage of the first discharge pulse rises from 0 to V1 and a time in which the voltage of the first discharge pulse is maintained at VI, and the pulse width of the second discharge pulse being a sum of a time in which a voltage of the second discharge pulse rises from 0 to V1 and a time in which the voltage of the second discharge pulse is maintained at V1. a pressure chamber accommodating liquid; an actuator configured to change a volume of the pressure chamber in accordance with a drive signal applied to the actuator; and an application unit configured to apply the drive signal to the actuator, the drive signal including: a first discharge pulse that causes liquid to be discharged from a nozzle communicating with the pressure chamber; a second discharge pulse that is applied after the first discharge pulse and causes liquid to be discharged from the nozzle communicating with the pressure chamber; and a vibration pulse that is applied before the first discharge pulse and has a potential difference having a polarity opposite to that of the first discharge pulse and the second discharge pulse, and causes a pressure vibration to be generated in the liquid to promote discharge of the liquid during at least one of the first discharge pulse and second discharge pulse, a first discharge pulse that causes liquid to be discharged from a nozzle communicating with the pressure chamber; a second discharge pulse that is applied after the first discharge pulse and causes liquid to be discharged from the nozzle communicating with the pressure chamber; and a vibration pulse that is applied before the first discharge pulse and has a potential difference having a polarity opposite to that of the first discharge pulse and the second discharge pulse, and causes a pressure vibration to be generated in the liquid to promote discharge of the liquid during at least one of the first discharge pulse and second discharge pulse, characterized in that the application unit is further configured such that a period between a center of the first discharge pulse and a center of the second discharge pulse is 1.5 times to 2.5 times a half-period of a main acoustic resonance frequency of the liquid in the pressure chamber, and a pulse width (dpA) of the first discharge pulse is closer to the half-period of the main acoustic resonance frequency than a pulse width (dpB) of the second discharge pulse, the pulse width of the first discharge pulse being a sum of a time in which a voltage of the first discharge pulse rises from 0 to V1 and a time in which the voltage of the first discharge pulse is maintained at VI, and the pulse width of the second discharge pulse being a sum of a time in which a voltage of the second discharge pulse rises from 0 to V1 and a time in which the voltage of the second discharge pulse is maintained at V1.