Liquid container, ink jet recording apparatus and liquid filling method

An ink filling method for filling a liquid container with ink, wherein said liquid container including a liquid containing portion for containing ink;

• a liquid introduction portion for introducing the ink into the liquid containing portion;
• a liquid discharge portion for discharging the ink to an outside from an inside of said liquid containing portion;
• a gas-liquid separation film;
• a gas-liquid blocking portion disposed adjacent to said gas-liquid separation film, said method comprising:
• a step of introducing the ink into said liquid containing portion by discharging the gas from said liquid containing portion through said gas-liquid separation film;
• a step of moving a contact line where a gas-liquid interface between the ink and the gas contacts said gas-liquid separation film moves toward a boundary between said gas-liquid separation film and said gas-liquid blocking portion;
• a step wherein the supply of the ink stops upon arrival of said contact line at a boundary between said gas-liquid separation film and said gas-liquid blocking portion.