Ink container

An ink container comprising:

• a negative pressure generating member accommodating portion for accommodating a negative pressure generating member for retaining therein pigment ink to be supplied to an ink jet head;
• an ink supply port for supplying the ink to said ink jet head, said ink supply port being disposed at a lower position with respect to a direction of gravity force in use of said ink container;
• an air vent for fluid communication between said negative pressure generating member accommodating portion and an ambient air;
• and
• an ink blocking surface extending in a direction across the direction of the gravity force, said blocking surface is provided with a blocking portion for blocking the flow of the ink and a fluid communicating portion permitting the flow of the ink, wherein a sectional area, across the direction of the gravity force in said negative pressure generating member accommodating portion, of blocking portion is not less than 50%,
• wherein there are provided a plurality of such blocking surfaces, and said communicating portions thereof are not aligned in a line along the direction.