one end thereof opposite to the ink supply needle 100 is formed in each fluid passage forming member 84 additionally the other end of the ink supply aperture 85 is connected to the supply passage 62 of the case 60 through a supply communicating passage 96 disposed in the sealing member 95 further the main body of the fluid passage member 81 substantially has a rectangular shape that coincides with the rectangular shape of the case 60 excluding the connectors 92 when viewed from above i e the main body of the fluid passage member 81 is substantially rectangularly shaped in such manner that a pair of diagonal corners thereof appear to have been cut off when viewed from above hereby portions where the connectors 92 of the circuit substrate 90 are disposed will not be covered by the main body of the fluid passage member 81 upon securing the main body of the fluid passage member 81 to the case 60 incidentally a filter 110 for removing air bubbles and foreign substances from ink is disposed at an opening portion of one end of the ink supply aperture 85 i e the ink supply needle 100 is secured to the securing member 83 of the main body of the fluid passage member 81 through the aforementioned filter 110 each ink supply needle 100 is provided with a through passage 101 that communicates with the ink supply aperture 85 therewithin further it is configured such that ink from the ink container is supplied to the manifold 40 of the recording head 20 through the ink supply tube not illustrated the through passage 101 of the ink supply needle 100 the ink supply aperture 85 the ink supply passage 62 or the like by inserting the ink supply needle.