A liquid discharge device comprising: a pressure chamber to be filled with a liquid; a nozzle communicating with the pressure chamber; a piezoelectric actuator vibrated by application of a drive voltage (V p) and ON/OFF control of the drive voltage (V p) for discharging the liquid within the pressure chamber through the nozzle as liquid drop; a drive circuit for applying the drive voltage (V p) to the piezoelectric actuator; and a control unit for carrying out the ON/OFF control of the drive voltage (V p); wherein in a waiting state in which the drive voltage (V p) is on no ink is discharged from the pressure chamber, wherein the control unit turns the drive voltage (V p) off during a drive voltage off time period from the waiting state and then turns the drive voltage (V p) on again to reach a first voltage value (V H), thereby vibrating the piezoelectric actuator, wherein during the waiting state, the drive voltage is set to the first voltage value (V H), wherein the drive voltage off is zero and the first voltage value differs from the drive voltage off, wherein the pressure chamber volume is increased when the drive voltage (V p) is switched off and returned to the original volume when the drive voltage (V p) is switched on to discharge the liquid within the pressure chamber as the liquid drop through the nozzle, and the control unit includes a micro vibration control section which controls the driving of the drive circuit and repeats during a micro vibration time period (T S, T E) an operation of lowering the drive voltage and raising the drive voltage in a range between the first voltage value (V H) and a second voltage value (V L1, V L2) lower than the first voltage value (V H), in which range the drive voltage is not turned off while falling, thereby to micro-vibrate the piezoelectric actuator in a range in which no liquid drop is discharged from the nozzle, on the basis of a voltage fall time constant of a drive voltage waveform when the drive voltage is turned off and a voltage rise time constant of a drive voltage waveform when the drive voltage is turned on, which are previously set in the drive circuit, in order to carry out ON/Off control of the drive voltage to discharge the liquid drop, wherein the micro vibration control section is adapted to control the driving of the drive circuit such that the drive voltage is raised once the lowered drive voltage reaches the second voltage value (V L1, V L2), the drive voltage is lowered once the raised drive voltage reaches the first voltage value (V H), and that the micro-vibration of the piezoelectric actuator is repeatedly carried out for each discharge of a liquid drop, and wherein the control unit is adapted to set the micro vibration time period shorter than the drive voltage off period. a pressure chamber to be filled with a liquid; a nozzle communicating with the pressure chamber; a piezoelectric actuator vibrated by application of a drive voltage (V p) and ON/OFF control of the drive voltage (V p) for discharging the liquid within the pressure chamber through the nozzle as liquid drop; a drive circuit for applying the drive voltage (V p) to the piezoelectric actuator; and a control unit for carrying out the ON/OFF control of the drive voltage (V p);