To provide a stocking method in which a recording head can be protected against clogging even under such a state as an ink jet recorder is not used for a long period.

The stocking bag 23 is formed of an outer protective film layer, an intermediate layer including an evaporation film having gas barrier properties, and inner thermally fusible layer. When a cleaning switch is operated before long term stocking, old ink in a recording head is replaced by new ink through action of a suction pump coupled with a capping unit. Waste ink is absorbed to a waste ink absorbing material and held therein. An ink jet recorder 1 is placed, under that state, in the stocking bag 23 and the opening thereof is enclosed by a heat seal 27. When a user uses the ink jet recorder 1, the stocking bag 23 is enclosed by a press fastener 28.