PURPOSE: To provide a line ink jet recording apparatus constituted so that a liquid level is not changed even when the apparatus is obliquely arranged and the negative pressure of a nozzle part depending on the height difference between the liquid level of an ink tank and the nozzle part is not largely changed even when the arrangement angle of the apparatus is changed, generating no characteristic irregularity in a head and keeping good emission characteristics.

CONSTITUTION: Many nozzles 20 independently controllable in emission are divided into nozzle groups and the respective nozzle groups communicate with the corresponding specific ink tanks 21, 22, 23... 27. The respective ink tanks are allowed to communicate with each other by communication windows 38.