A projecting apparatus which projects an image for display using a discharge lamp as a light source, the discharge lamp being included in a light source unit, the projecting apparatus comprising: an air inlet (905, 907) for taking in a cooling medium for cooling the projecting apparatus, an air outlet (906, 928) for exhausting the cooling medium for cooling the projecting apparatus, a plurality of fans (412, 413, 902, 908, 910-912, 929) which each let the cooling medium flow in a predetermined direction, a posture sensor which detects a position of the projecting apparatus, and a control section which controls the plurality of fans (412, 413, 902, 908, 910-912, 929) according to the position detected by the position sensor; wherein: the projecting apparatus has a plurality of positions corresponding to different installation modes, the posture sensor is arranged to detect the position of the projecting apparatus, thereby to identify the installation mode of the apparatus, and the control section is arranged to control the plurality of fans (412, 413, 902, 908, 910-912, 929) in dependence on the installation mode, to cause the cooling medium to flow in the predetermined direction in each installation mode of the apparatus, characterised in that: the predetermined directions are different paths which bring air inside the light source unit along different directions; and the control section is arranged to control the rotation speeds and torques of the plurality of fans (412, 413, 902, 908, 910-912, 929) according to the identified installation mode of the projecting apparatus so that fans which suck cooling air into one of the predetermined paths where cooling air is not required are kept rotating only at a speed not so high as to generate an undesired negative pressure, while fans which are required to create air-flows into another one of the predetermined paths are allowed to be kept rotating powerfully. an air inlet (905, 907) for taking in a cooling medium for cooling the projecting apparatus, an air outlet (906, 928) for exhausting the cooling medium for cooling the projecting apparatus, a plurality of fans (412, 413, 902, 908, 910-912, 929) which each let the cooling medium flow in a predetermined direction, a posture sensor which detects a position of the projecting apparatus, and a control section which controls the plurality of fans (412, 413, 902, 908, 910-912, 929) according to the position detected by the position sensor; wherein: the projecting apparatus has a plurality of positions corresponding to different installation modes, the posture sensor is arranged to detect the position of the projecting apparatus, thereby to identify the installation mode of the apparatus, and the control section is arranged to control the plurality of fans (412, 413, 902, 908, 910-912, 929) in dependence on the installation mode, to cause the cooling medium to flow in the predetermined direction in each installation mode of the apparatus, characterised in that: the predetermined directions are different paths which bring air inside the light source unit along different directions; and the control section is arranged to control the rotation speeds and torques of the plurality of fans (412, 413, 902, 908, 910-912, 929) according to the identified installation mode of the projecting apparatus so that fans which suck cooling air into one of the predetermined paths where cooling air is not required are kept rotating only at a speed not so high as to generate an undesired negative pressure, while fans which are required to create air-flows into another one of the predetermined paths are allowed to be kept rotating powerfully. the projecting apparatus has a plurality of positions corresponding to different installation modes, the posture sensor is arranged to detect the position of the projecting apparatus, thereby to identify the installation mode of the apparatus, and the control section is arranged to control the plurality of fans (412, 413, 902, 908, 910-912, 929) in dependence on the installation mode, to cause the cooling medium to flow in the predetermined direction in each installation mode of the apparatus, characterised in that: the predetermined directions are different paths which bring air inside the light source unit along different directions; and the control section is arranged to control the rotation speeds and torques of the plurality of fans (412, 413, 902, 908, 910-912, 929) according to the identified installation mode of the projecting apparatus so that fans which suck cooling air into one of the predetermined paths where cooling air is not required are kept rotating only at a speed not so high as to generate an undesired negative pressure, while fans which are required to create air-flows into another one of the predetermined paths are allowed to be kept rotating powerfully. the predetermined directions are different paths which bring air inside the light source unit along different directions; and the control section is arranged to control the rotation speeds and torques of the plurality of fans (412, 413, 902, 908, 910-912, 929) according to the identified installation mode of the projecting apparatus so that fans which suck cooling air into one of the predetermined paths where cooling air is not required are kept rotating only at a speed not so high as to generate an undesired negative pressure, while fans which are required to create air-flows into another one of the predetermined paths are allowed to be kept rotating powerfully.