LIGHT SOURCE DEVICE AND PROJECTION DEVICE

To provide a light source device capable of improving the use efficiency of an internal space of the light source device by suppressing an increase in the number of members, and to provide a projection device including the light source device.SOLUTION: A light source device includes a rotary wheel device 150 having a rotary wheel 151 including a reflection region for reflecting light in a blue wavelength range and a transmission region for transmitting at least the light in a red wavelength range and the light in a green wavelength range; and a dichroic mirror 200 for transmitting the light in a blue wavelength range and the light in the red wavelength range and reflecting the green wavelength range. The dichroic mirror 200 which intersects with a part of the rotating wheel 151 so as to overlap therewith and includes an intersection part 200a to which the light in the blue wavelength range, the light in the red wavelength range, and the light in the green wavelength range are irradiated.SELECTED DRAWING: Figure 5 【課題】部材点数の増加を抑えることにより、光源装置の内部空間の使用効率を向上させることができる光源装置と、この光源装置を備える投影装置を提供する。【解決手段】光源装置は、青色波長帯域光を反射する反射領域と、少なくとも赤色波長帯域光と緑色波長帯域光を透過する透過領域とを含む回転ホイール１５１を有する回転ホイール装置１５０と、青色波長帯域光と赤色波長帯域光を透過し、緑色波長帯域光を反射するダイクロイックミラー２００と、を備え、ダイクロイックミラー２００は、回転ホイール１５１の一部と重なるように交差し、かつ青色波長帯域光、赤色波長帯域光、及び緑色波長帯域光が照射される交差部２００ａを含んでいる。【選択図】図５