ILLUMINATION DEVICE

摘要

An illumination device (1) can prevent the deterioration of the luminous flux utilization efficiency and suppress the luminance unevenness while the light guiding lens (3) can project light along its surface. The illumination device (1) can include a first light source (21) configured to emit light; and a light guiding lens (3) configured to receive the light from the first light source (21) and guide the light to project light. The light guiding lens (3) includes a first light emission portion (41) in a plate shape that extends in a predetermined direction and has a main surface with a plurality of reflecting cuts formed therein, and a first light guiding portion (51) provided to the first light emission portion (41) at an end portion thereof in the predetermined direction. The first light guiding portion (51) is configured to project more than the first light emission portion (41) in a thickness direction of the first light emission portion (41) and extend along the end portion of the first light emission portion (41). The first light source (21) is disposed to face to a portion of an end face of the first light guiding portion (51) in an extending direction in which the first light guiding portion (51) extends, the portion of the end face projecting more than the first light emission portion (41) in the extending direction. A portion of the end face of the first light guiding portion (51) in the predetermined direction disposed at a position in the predetermined direction of the first light emission portion (41) has a plurality of reflecting cuts arranged side by side in the extending direction.