A recording condition determining method executed by a recording device performing recording by a main scanning (P1, P2, P3, P4), in which while moving a recording head (15) in a main scanning direction (D1, D2), dots are ejected from nozzles (17) onto a recording medium (30), and a sub scanning, in which the recording medium is transported in a sub scanning direction (D3). The method includes a patch recording step of recording patches (45, 46, 47, 45-1, 46-1, 47-1) on the recording medium by overlap-processing in which the main scanning is performed on a partial region of the recording medium a plurality of times in an overlapping manner, the patch recording step being performed by recording the patches at a plurality of different positions in the sub scanning direction by a plurality of types of the overlap-processing under respectively different recording conditions, in a single recording job performed by the recording device. The method further includes a selection accepting step of accepting selection of a patch from among a plurality of the recorded patches, and a determination step of determining, as a recording condition of the overlap-processing of an actual recording, the recording condition of the overlap-processing corresponding to the patch selected in the selection accepting step.