An ink cartridge holding device including: a holder having an opening which allows insertion and withdrawal of the ink cartridge through the opening; a door attached to the holder which is pivotable between (a) an open position at which the opening is uncovered for permitting the insertion and the withdrawal and (b) a closed position at which the opening is covered for inhibiting the insertion and withdrawal; a locking member attached to the door which is displaceable, which has an exposed portion exposed in a front face of the door, and which is for locking the door at the closed position when the locking member is placed in a predetermined position and for permitting the door to be pivoted toward the open position when the locking member is displaced from the predetermined position; and a protruding portion which is provided near to the exposed portion to allow the locking member to be displaced and which protrudes by a greater amount than the exposed portion in a direction away from the front face of the door.