Patent ID: 8777384

Claim:
An ink cartridge comprising: a housing having a longwise direction, a shortwise direction orthogonal to said longwise direction, and a thickness direction respectively orthogonal to said longwise direction and said shortwise direction; and a substantially bag-shaped reservoir portion configured to store ink in its interior, disposed within said housing so that an end portion on one side in said thickness direction contacts said housing; wherein: said ink cartridge is for supplying said ink and is used in a posture where said longwise direction and said thickness direction are substantially horizontal, and said shortwise direction is substantially vertical; said ink cartridge further comprising: a rotating member that is rotatably supported with respect to said housing at a lower end portion, comes in contact with the other side of said reservoir portion in said thickness direction, and rotates in accordance with an ink volume within said reservoir portion, thus executing a display in accordance with the ink volume by that rotational position; and a displacement suppressing portion that creates a predetermined gap between the end portion on the one side in said thickness direction and a lateral surface on one side of said housing in said thickness direction and extends above said rotating member, causing an upper portion of said reservoir portion to be inserted through said gap, thereby suppressing displacement of said reservoir portion to the other side in said thickness direction.