This in-compartment air-conditioning device (100) is provided with a composition regulation unit (200). Outside air flowing in a first inflow passage (111) and interior air flowing in a second inflow passage (112) flow into the composition regulation unit (200) as air to be treated. The composition regulation unit (200) divides the air to be treated into first air and second air. The first air flows into a first outflow passage (131). The second air flows into a second outflow passage (132). An outlet switching mechanism (135) changes the destination of the first air and the second air.

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