In an ink supply system for connecting with an ink container with a hollow communicating tube provided in the ink container, in order to prevent leakage of the ink from the communicating tube and simultaneously to prevent damage of the communicating tube projected from the ink container, the communicating tube 60 is made movable to be projected from the inside of the ink container and to be inserted into a recording head, thus establishing liquid communication between the inside of the ink container and the inside of the recording head.