In the substrate constituting the object is the head member of the present invention to an ink jet head connection unit which is the ink supply path formed by appropriate for other members, not on the ink discharge failure, and highly reliable ink that leakage is not generated, as providing a is easy to manufacture the ink jet head connection unit, the head member and a head member and a supply port 257 for supplying ink to the unit 210, the recess 243, the adhesive is filled are formed in the bottom portion provided, and the case member 240 and the head member 21, when combined, the head member 210 and the case member, the space which the adhesive is filled for joining (240) the mechanism casing member 240 with a 241 248 is formed in the case of this combination.
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