An air-conditioning device is equipped with a branching unit 60 for addition of usage-side heat exchangers. The branching unit 60 is equipped with: a connecting section 61, which is connected via connecting conduits 70 to a connection port 2a used for branching unit connection in a relay unit 2, and through which a heat medium in a heat medium circulation circuit B passes; a branching section 62, which is connected to one or more additional usage-side heat exchangers 35e-35h, and which branches the heat medium flowing into the branching unit 60 via the connecting section 61, and circulates the heat medium to the one or more additional usage-side heat exchangers 35e-35h; and second heat medium flow path switching means (first heat medium flow path switching devices 32e-32h, second heat medium flow path switching devices 33e-33h, and heat medium flow path switching devices 34e-34h), which are provided in correspondence with the one or more additional usage-side heat exchangers 35e-35h, and which connect the one or more additional usage-side heat exchangers 35e-35h to one of multiple inter-heat-medium heat exchangers 25a, 25b.
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