An ink tube connecting method in a liquid injection recording apparatus provided with an ink jet recording head unit and an ink tank for storing therein liquid to be supplied to the ink jet recording head unit, and having an ink tube communicating the ink jet recording head unit with the ink tank and an ink tube for discharging the gas and/or liquid in the ink jet recording head unit, is characterized in that a plane formed in the connecting portion of one of the ink tubes while containing the ink tubes and a plane formed in the connecting portion of the other of the ink tubes while containing the ink tubes are arranged without perpendicularly intersecting each other, and the ink tubes are integrally arranged in parallelism to each other in at least a portion thereof. The specification also discloses such liquid injection recording apparatus.