A liquid discharge head for controlling discharging of liquid, the liquid discharge head including a valve body configured to be movable, and to be pressed towards a discharge port from which the liquid is discharged; and a recessed portion provided in the valve body at a position facing the discharge port.

A first duct connects a tank and a syringe together. A second duct connects the syringe and a dumper together. A third duct connects the dumper and the tank together. When a time (deformation restoration time) until the swollen dumper is returned to its original shape is determined, a controller deforms the dumper. The controller sets the position of a liquid level in the tank less than a specified position (syringe filling processing). The controller opens the third duct so as to measure a liquid level recovery time until the output of a liquid level sensor is changed (time measurement processing). The controller determines a deformation restoration time based on the liquid level recovery time.

A liquid discharge head for controlling discharging of liquid, the liquid discharge head including a valve body configured to be movable, and to be pressed towards a discharge port from which the liquid is discharged; and a recessed portion provided in the valve body at a position facing the discharge port.