00x) of the light source optical system (000) is displaced relative to the optical axis (000x) of the light separating optical system (000); and a focusing lens (000) which is disposed so that the optical axis (000x) of the focusing lens is coincident with the optical axis (000x) of the light separating optical system (000), for focusing the light output from the light source optical system (000) and inputting the focused light into the light 