Liquid droplet jetting apparatus and ink-jet printer

An ink-jet printer which performs printing by jetting an ink onto an object, comprising;

• a transporting mechanism which transports the object in a predetermined direction and
• an ink-jet head including a channel unit which includes a common liquid chamber which is long in a extending direction, and which has a first area and a second area, the first area having a liquid inflow port through which the liquid flows in, and a plurality of first connection ports through which the liquid flows out, the second area having a second connection port which is formed on a side opposite to the liquid inflow port with respect to the first connection ports;
• a plurality of pressure chambers communicating with the common liquid chamber;
• a plurality of first discharge ports communicating with the pressure chambers;
• a second discharge port communicating with the common liquid chamber;
• a plurality of first individual liquid channels each ranging from one of the first connection ports of the common liquid chamber up to one of the first discharge ports via one of the pressure chambers;
• and a second individual liquid channel ranging from the second connection port up to the second discharge port:
• and an energy imparting mechanism which imparts a discharge energy to the liquid in the pressure chambers
• wherein an acoustic capacitance of the second area per unit length along the extending direction is greater than an acoustic capacitance of the first area per unit length.