A projection display device according to an embodiment in which a light source emits a laser light to be used in projection of an image and in which a hide function is provided that temporarily hides the projection of the image by stopping the emission of light from the light source. The projection display device includes: a light source temperature sensor that detects the temperature of the light source; a light source heating unit that heats the light source; a control unit that controls the operation of at least the light source and the light source heating unit; and a switch that is used to instruct implementation or deactivation of the hide function. When implementation of the hide function is instructed using the switch, the control unit stops the emission of light from the light source, obtains the temperature detected by the light source temperature sensor, and controls the light source heating unit to maintain the light source at the obtained temperature.