A HUD includes a light source unit 57, a light modulation element 54 that modulates light that is emitted from the light source unit 57, a projection portion that projects the modulated light onto a projection surface, wind guide paths 61 and 62 that guide wind W sent from an air conditioning device 9 of a car 100 to the light source unit 57, the wind guide path 61 that guides the wind W to the light modulation element 54, a shutter 63 for performing blocking and opening of the wind guide paths 61 and 62, and a system control unit 64 that selectively performs control for blocking the wind guide paths 61 and 62 and control for opening the wind guide paths 61 and 62 by controlling the shutter 63.