Illumination device

An illumination device comprising:

• a light guide comprising an upper surface, a lower surface facing the upper surface, and a light entering surface connecting the upper surface and the lower surface;
• a first light emitting portion configured to emit light having a first wavelength range;
• a second light emitting portion configured to emit light having a second wavelength range different from the first wavelength range;
• and
• a third light emitting portion configured to emit light having a third wavelength range different from the first wavelength range and the second wavelength range, wherein
• the upper surface includes a first surface connected to the light entering surface, a second surface spaced apart from the first surface, located between the first surface and the lower surface in a thickness direction of the light guide and parallel to the first surface, a third surface spaced apart from the second surface, located between the second surface and the lower surface in the thickness direction and parallel to the second surface, and a fourth surface,
• the first surface, the second surface, the third surface and the fourth surface are arranged in this order in a first direction,
• regarding a width in the first direction, a width of the first surface is less than a width of the second surface, and the width of the second surface is less than a width of the third surface,
• the lower surface includes a fifth surface facing the fourth surface and parallel to the fourth surface,
• an angle between the light entering surface and the first surface is an acute angle, and
• the first light emitting portion, the second light emitting portion and the third light emitting portion face the light entering surface and are arranged in this order in the first direction.