Head unit and liquid discharge apparatus

A head unit comprising:

• a first head having:
• a first nozzle array having first multiple nozzles arrayed in a first direction;
• and
• a second nozzle array:
• disposed downstream of the first nozzle array in a second direction intersecting the first direction;
• and
• having second multiple nozzles arrayed in the first direction;
• and
• a second head:
• disposed downstream of the first head in the second direction;
• and
• arranged adjacent to the first head in a staggered manner,
• the second head having:
• a third nozzle array having third multiple nozzles arrayed in the first direction;
• and
• a fourth nozzle array:
• disposed downstream of the third nozzle array in the second direction;
• and
• having fourth multiple nozzles arrayed in the first direction,
• wherein each of the first head and the second head has an overlapping region in which the first head and the second head overlap with each other in the first direction,
• the first nozzle array of the first head has a first nozzle density in the first direction in the overlapping region, and
• the fourth nozzle array of the second head has a second nozzle density larger than the first nozzle density in the first direction in the overlapping region.