To compensate for long-term deterioration of elements and the like such as a plurality of light sources and fluorescent materials to maintain both color reproducibility and brightness of a projection image for a long time.

A projection device includes: a semiconductor laser 20 for emitting blue (B) light; a color wheel (CW) 24 and a motor 25 for generating from the blue light blue (B) light of transmitted light and green (G) light of reflected phosphor light in time division; LED 21 for emitting red (R) light; a light sensor LS for detecting light intensity of a plurality of colors from a light source 17; a projection light processing unit 31 and a CPU 32 for controlling drive timing of the semiconductor laser 20 and the LED 21 so as to cyclically generate the B light, G light and R light, and adjusting an emission state of the semiconductor laser 20 and the LED 21 on the basis of the detection result at the light sensor LS; input units (11 and 12) for inputting an image signal; and a projection system (13-16, 18 and 19) for forming a color light image corresponding to the image signal inputted in the input units (11 and 12) by using the RGB light to project the image.