Vehicle air-conditioning unit

A vehicle air-conditioning unit comprising:

• an air-conditioning case including
• a first air passage,
• a second air passage connected to the first air passage, an air flowing from the first air passage to the second air passage, and
• a third air passage connected to the first air passage in parallel with the second air passage, the air flowing from the first air passage to the third air passage, a downstream end of the third air passage being joined together with the second air passage;
• a heater provided in the third air passage and heating the air flowing in the third air passage;
• and
• an air mix door located downstream of the heater in the airflow, the air mix door opening and closing the third air passage, wherein
• the third air passage includes an opening hole that is an upstream end of the third air passage,
• the air-conditioning case includes a hole separation portion dividing the opening hole of the third air passage into a plurality of separation holes,
• the hole separation portion is located upstream of the heater in the airflow,
• the hole separation portion includes a plurality of plate portions having plate shapes,
• the plurality of plate portions are connected to each other to form the hole separation portion and are arranged such that a thickness direction of each plate portion of the plurality of plate portions intersects with a direction of the air passing through the opening hole,
• each separation hole of the plurality of separation holes is defined and surrounded by some of the plurality of plate portions,
• each plate portion of the plurality of plate portions has an upstream edge and a downstream edge, and
• at least some plate portions of the plurality of plate portions are inclined away from the second air passage from the upstream edge to the downstream edge, the some plate portions of the plurality of plate portions extending in parallel with each other.