Bubble clogging at the time of attaching a liquid storage unit to an ink tank is suppressed. The ink tank comprises a joint pin that is inserted into a joint hole comprised by the liquid storage unit, a reservoir portion that internally reserves ink supplied via the joint hole and the joint pin, and a movable portion capable of moving inside the reservoir portion. As a protruding portion comprised by the liquid storage unit is inserted into a concave portion formed in the movable portion while being in contact therewith, the movable portion moves from a first position to a second position higher than the first position.