A projection image display device includes an indoor unit (1) to be located indoors and an outdoor unit (4) to be located outdoors. The outdoor unit (4) includes a second refrigerant piping (41) that forms a loop refrigerant path in combination with a first refrigerant piping (21), a cooling device (42), and a cooling control circuit (45) that controls cooling for R, G, B laser heat sinks (18, 19, 20) by the cooling device (42). The indoor unit (1) includes a main control circuit (27) that communicates with the cooling control circuit (45) to control the cooling by the cooling device (42).
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