There is provided a line printer including: a nozzle that discharges liquid; a pressure chamber that communicates with the nozzle; a piezoelectric element that is provided to correspond to the pressure chamber and to discharge liquid; a pulse generation unit that generates a drive pulse to discharge liquid from the nozzle and an inspection pulse to inspect a liquid discharge state; and a residual vibration detection unit that detects residual vibration in the pressure chamber, which occurs after the inspection pulse is applied to the piezoelectric element. The drive pulse is caused to be applied to the piezoelectric element and the inspection pulse is caused not to be applied to the piezoelectric element at a first printing speed. The drive pulse and the inspection pulse are caused to be applied to the piezoelectric element at a second printing speed. The second printing speed is slower than the first printing speed.