Head unit and liquid ejecting apparatus

A head unit configured to eject a first liquid, a reaction liquid that aggregates the first liquid, and a treatment liquid that is less likely to aggregate with the reaction liquid than the first liquid, the head unit comprising:

• a plurality of liquid ejecting heads disposed to be arranged in a first direction, wherein
• each of the plurality of liquid ejecting heads includes a plurality of head chips having one or more nozzle rows,
• a first distance is a distance in the first direction between a nozzle row disposed at an end in the first direction and a nozzle row disposed at an end in a second direction opposite to the first direction among a plurality of the nozzle rows in the liquid ejecting head,
• the plurality of liquid ejecting heads include a first head and a second head adjacent to each other,
• a second distance in the first direction between a nozzle row closest to the second head among a plurality of the nozzle rows in the first head and a nozzle row closest to the first head among a plurality of the nozzle rows in the second head is longer than the first distance,
• the first head includes a plurality of first head chips having one or more first nozzle rows for ejecting the first liquid, and
• the second head includes one or more second head chips having one or more second nozzle rows for ejecting the reaction liquid and one or more third head chips having one or more third nozzle rows for ejecting the treatment liquid.