Projection device

The projection device is well cooled by one cooling fan. A projection device (10) is provided with: an optical device (60); a control circuit board (300) disposed on the upper side of the optical device (60); a cooling fan (280) disposed in the vicinity of an air suction part (264), which is a rear surface air suction part of the housing (250) on the opposite side in the projection direction, the cooling fan (280) having an upper surface air suction port (280a) for sucking air from the upper surface and a lower surface air suction port (280b) for sucking air from the lower surface; and heat sinks (a first heat sink (281) and a second heat sink (282)) provided corresponding to the discharge port (280c) of the cooling fan (280) and connected to the optical device (60). The flow path resistance on the lower surface suction port (280b) side is smaller than the flow path resistance on the upper surface suction port (280a) side. 用1个冷却风扇将投影装置良好地冷却。投影装置(10)具备：光学装置(60)；控制电路基板(300)，配置在光学装置(60)的上侧；冷却风扇(280)，配置在投影方向的相反侧的