Ink jet head, method of manufacturing ink jet head, and printer

A printer equipped with an ink jet head having a plurality of nozzles (120) for discharging ink supplied from an ink supply part (50), characterized in that comprising:

• a head main body (3) including a plurality of pressure chambers (112) provided one for each of said nozzles (120) and filled up with ink, a plurality of pressurizers (140) provided one for each of said pressure chambers (112) for pressurizing said pressure chamber (112) to discharge said ink in said pressure chamber (112) from said nozzle (120) and a common ink passage (110) for supplying said ink from said ink supply part (50) to said plurality of pressure chambers (112);
• and
• a joint section (8) formed on said head main body (3) to protrude therefrom for joining said ink supply part (50) to said head main body (3),
• said head main body (3) being formed on a substrate (122) and a communicating passage (81) for making a communication between said common ink passage (110) and an ink supply port (51) of said ink supply part (50) is formed in substrate (122) by partially removing said substrate (112) from said head main body (3), and said joint section (8) being formed as a residual portion of said substrate (122) on said head main body (3) by partially removing said substrate (112).