A correction data setting apparatus, which sets correction data in a memory for storing the correction data for correcting a pulse width of a drive pulse signal applied to each actuator corresponding to each nozzle of an inkjet head, comprises a generation section which sequentially generates a channel No. for individually identifying each nozzle; an output section which outputs a parameter required for arithmetic which represents a characteristic of a correction amount with respect to an arrangement direction of the nozzles; an arithmetic section which executes the arithmetic using the parameter output from the output section to calculate the correction amount for each channel No. generated from the generation section; a conversion section converts the correction amount calculated for each channel No. by the arithmetic section to the correction data; and a setting section sets the correction data obtained for each channel No. by the conversion section in the memory.