Each of a plurality of head modules of a first inkjet head includes a black nozzle array configured to eject a black ink and a cyan nozzle array configured to eject a cyan ink. A plurality of nozzles of the cyan nozzle array and a plurality of nozzles of the black nozzle array are offset by a half pitch in a main scanning direction. Each of a plurality of head modules of at least one second inkjet head other than the first inkjet head includes a magenta nozzle array configured to eject a magenta ink and a yellow nozzle array configured to eject a yellow ink.