To provide an ink cartridge capable of preventing damage to an ink pouch and leakage of ink which may be caused by vibration in transportation or impact by dropping applied in the delivery process.

This ink cartridge 20 houses a flexible ink pouch 1 which is so constituted that four sides of a laminated film are closed by thermal welding to be in a bag, the inner section is filled with inkjet ink, and an ink outlet is provided at one side in the four welded sides. One face of a plane area of the ink pouch 1 is fixed to the bottom of the inner section of an ink cartridge case. Both ends of an ink pack are fixed by inner side faces of the ink cartridge case having the ink pouch 1 fixed thereto and a case cover.