Abstract: An ink cartridge has a container main body 2 having a through hole 60 for making an ink storage chamber and an atmospheric open chamber 501 to communicate with each other, and an atmospheric open valve 601 having a valve body 65 capable of opening and closing the through hole 60 of the container main body 2 and an elastic member 62 capable of pressing the valve body 65 in a closed direction. In an assembling structure of the atmospheric open valve 601 in the atmospheric open chamber 501, the valve body 65 is placed at such a position blocking the opening of the through hole 60, the elastic member 62 is positioned in the atmospheric open chamber 501 as a bend piece shaped like<is expanded, and the elastic member 62 in the positioned state presses at one end part the valve body 65 in the closed direction and is fixed at an opposite end part to the inside of the atmospheric open chamber 501.

Abstract: An ink cartridge 1 is detachably connected to a head of a record apparatus and has a vessel main body 2 having an ink tank chamber 11 opened to the atmosphere in a state in which the head and the cartridge are connected and an ink end chamber (second ink storage chamber 16, etc.,) communicating with the ink tank chamber 11 and leading to the head. The vessel main body 2 is formed with a first opening 85 communicating with the ink tank chamber 11 and a second opening 86 communicating with the ink end chamber.

Abstract: An ink cartridge 1 is detachably connected to a head of a record apparatus and has a container main body 2 having an ink tank chamber 11 opened to the atmosphere in a state in which the head and the cartridge are connected and a first opening 85 through which ink can be injected into the ink tank chamber (second ink storage chamber 16, etc.,). Such an intermediate wall 301 partitioning the ink tank chamber 11 into two space parts 11a and 11b placed side by side in an ink injection direction is disposed in the ink tank chamber 11 and is formed with a through part 301a through which ink can be injected.