The initial filling method is the initial charge solution (68) comprising a functional fluid or solvent to the oil passage within the head of the functional liquid discharge to the functional liquid discharging with respect to a work head (3) charging of the functional liquid droplet discharge head 3 of the present invention as a function initial filling method of the liquid discharge head 3, which, charge stored in the sealing step, the sealed container 71 to seal the functional fluid inlet 51 of features that the head connected to the path in the liquid discharge head 3, and pressure process to the internal liquid 68 in the immersion step and the function liquid discharge head, the closed container 71 for immersing the (3) under reduced pressure (減壓) a predetermined degree of vacuum for exhausting the atmosphere in the sealed container 71, after decompression process, the interior of the sealed container 71 is provided with a step of abdominal pressure abdominal pressure (復 壓). ; The initial charge, the functional fluid, solvent sealing, priming solution, immersion, vacuum, reduced pressure, sealing, stress
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