Patent ID: 8011768

Claim:
An ink tank attachable to and detachable from an attachment section of an ink jet printing apparatus, the attachment section being provided with an ink receiving section, a first fitting section and a second fitting section to be engaged with the ink tank, an electric contact, and a board-contact positioning section, the ink tank comprising: a housing; an ink retaining member which is housed in the housing and retains ink; a supply port configured to abut the ink receiving section; a board being connectable to the electric contact; and a board attachment positioning section disposed on a bottom face of the housing and formed as a protrusion to be engaged with the board-contact positioning section, wherein the supply port abuts, at an abutting center thereof, the ink receiving section, and wherein the supply port and the board attachment positioning section are provided on the bottom face of the housing such that the board attachment positioning section is located on one area of two areas defined by dividing the bottom face by a centerline extending in a longitudinal direction of the housing through a center of width of the bottom face and the abutting center of the supply port is located on the other area of the two areas.