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An ink cartridge and an ink storage device including the same are provided, which has a stable quality, lower ink residue, less components, lower cost, and low impact to the environment. The ink storage device is assembled by an ink receiving portion, a sleeve, and a pin plug. The ink receiving portion is formed by welding and sealing the edges of a pair of plates. The sleeve has a first end portion and a respective second end portion. The first end portion is connected to the ink receiving portion and the second end portion exposes out of the ink receiving portion. An interior of the sleeve has a penetrating hole connecting the ink receiving portion. The pin plug is made of an elastic material and is installed to the second end portion of the sleeve. A storage portion for storing the ink is formed in the pin plug, and an end of the pin plug is formed as a linking hole linking the ink receiving portion with the storage portion through the penetrating hole. Another end of the pin plug is formed as with cut which is acted as a function of valve.
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