An ink-jet head comprises pressure chambers arranged along a first flat face,
and nozzles each open in a second flat face opposing to the first flat face. The
nozzles are connected to the respective pressure chambers. The ink-jet head further
comprises a common ink chamber extending along an arrangement of the nozzles. The
common ink chamber is connected to each pressure chamber to supply ink to the pressure
chamber. The ink-jet head further comprises a wall provided between the second
flat face and a wall surface of the common ink chamber. The wall comprises a bottom
at a distance not less than a predetermined distance from the second flat face,
and a reinforcement portion at a distance more than the predetermined distance
from the second flat face.
