Liquid droplet jetting apparatus and recording apparatus

A liquid droplet jetting apparatus which jets a droplet of a liquid, comprising:

• a common liquid chamber to which the liquid is supplied;
• a plurality of pressure chambers which communicate with the common liquid chamber and which causes a pressure change in the liquid;
• a plurality of nozzles which communicate with the pressure chambers respectively, and each of which jets the droplet of the liquid;
• a pressure attenuation chamber which has a throttled portion having a cross-sectional area smaller than a cross-sectional area of the common liquid chamber, and an attenuation portion having a cross-sectional area greater than the cross-sectional area of the throttled portion, the attenuation portion being connected to the common liquid chamber via the throttled portion;
• a discharge port which is formed in the pressure attenuation chamber;
• a discharge channel which is connected to the discharge port and having a throttle in which a channel area of the discharge channel is decreased;
• and a dummy nozzle which is connected to the discharge port via the discharge channel, and which is open to an atmosphere.