embodiment 11 in the third embodiment the first connecting portion 50 h and the second connecting portion 50 j are formed on the bottom face of the case 50 a and the ink lead out port 50 i and the air introducing port 50 k penetrate and are opened at the bottom face of the case 50 a respectively consequently the ink cartridge 50 can be caused to cope with the case in which the air is to be introduced into or the ink is to be led out of the bottom face of the case 50 a corresponding to a position in which the ink cartridge 50 is provided and a position of the air pump 33 accordingly it is possible to enhance the degree of freedom of the design of the printer body 11 while the four ink cartridges 45 to 48 are provided in each of the embodiments the number of the ink cartridges mounted on the printer body 11 may be optional in each of the embodiments the bottom face of the case and the lid in the ink cartridges 45 to 48 are provided in the printer body 11 in almost parallel with the right side plate 12 a and the left side plate 12 b in the frame 12 in addition the ink cartridges 45 to 48 may be provided in any direction for example the bottom face of the case is provided to be a lower face in the embodiments the films 45.