Air conditioner

An air conditioner that includes an indoor unit having an indoor heat exchanger, an outdoor unit having an outdoor heat exchanger connected to the indoor heat exchanger through a refrigerant pipe, and an outside casing housing at least the outdoor unit and is attached to a building wall that partitions an outdoor space and an indoor space, wherein

• the outside casing that is fitted in a wall communication hole and has an inside space in which the outdoor unit is capable of being disposed, the wall communication hole being formed in the building wall, and the wall communication hole communicating between the outdoor space and the indoor space,
• the inside space is opened to the outdoor space,
• the outdoor unit is disposed in the inside space of the outside casing,
• a thermal insulation material is disposed in the inside space of the outside casing,
• the thermal insulation material at least includes
• a first thermal insulation portion that is disposed on a side of the outdoor space, and
• a second thermal insulation portion that is disposed on a side of the indoor space and is attachable and detachable, and
• the first thermal insulation portion has a recess portion in which the second thermal insulation portion fits.