The present invention is connectable liquid container to the ink jet head of the ink jet device comprising: a first chamber accommodating a negative pressure producing material, and also the first recording liquid supply inlet and, outside for the chamber to supply the liquid to the ink jet head a first chamber having an air vent portion communicating with the air; The second chamber and accommodating a liquid supplied to the first chamber, the second chamber is adjacent the bottom portion through the off formed communicating connection port from said air vent portion and communicates with the first chamber, the second chamber a second chamber communicating with the portion other than the connection port is substantially sealed and; In the liquid container having the partition wall separating the first chamber and the second chamber and also forming the upper part of the communicating connection port, the negative pressure producing material portion adjacent to said recording liquid supply inlet for is of the ink jet head It provides a liquid container, characterized in that the compressible zone can be compressed by the ink containing tube.