Refrigeration cycle apparatus

A refrigeration cycle apparatus using a flammable refrigerant, the refrigeration cycle apparatus comprising:

• an outdoor unit including at least a compressor and an outdoor pipe;
• an indoor unit including at least an indoor heat exchanger and an indoor pipe;
• an extension pipe connecting the outdoor pipe and the indoor pipe to each other;
• a pipe connection chamber disposed in a casing constituting the indoor unit and housing a connection portion connecting the indoor pipe and the extension pipe;
• and
• a pipe draw-out chamber disposed in the casing constituting the indoor unit, the extension pipe drawn out from the pipe connection chamber passing through the pipe draw-out chamber,
• the pipe connection chamber and the pipe draw-out chamber being partitioned from each other by a partition having a through hole, the extension pipe penetrating the through hole,
• a part of the pipe draw-out chamber being constituted by a part of the casing constituting the indoor unit, the extension pipe penetrating a through hole formed in the part of the casing.