The invention relates to a method for adjusting ejection timing including:
forming adjustment patterns on a medium by shifting relative ejection
timings of liquid droplets from a first nozzle row and a second nozzle
row lined up in a direction intersecting a row direction in which nozzles
of the first nozzle row and the second nozzle row are lined up, while
shifting the first nozzle and the second nozzle in respect to the medium
in the intersecting direction of the first nozzle row and the second
nozzle row; and determining adjustment amounts of relative ejection
timings of the first nozzle row and the second nozzle row based on the
adjustment patterns, wherein the adjustment patterns are formed in the
intersecting direction in a plural number separated from each other by a
predetermined distance, and the ejection timing is adjusted based on an
average of the adjustment amounts determined based on the adjustment
patterns.