The lighting device

The present invention provides an illumination device, may simply be combined and maintenance of the light source and the light guide portion, the positional relationship accurately reproducing light source and the incident surface of the light guide portion, a small illumination pattern differences between individual products. Mounting the LED lights (6) of the printed circuit board (12) into the light guide portion (4) integrally formed and temporarily arranged in the light guide portion (4) at least one light introducing portion (5) on the end, then the lid (3) is fixed. A positional relationship between the printed circuit board is mounted with an LED lamp (6) (12) and the light guide portion (4) by causing the printed circuit board (12) of the recess of the locking hook (9) (11) and the light introducing portion (5) fitted to the positioning surface of the light guide portion (4) perpendicular to the longitudinal direction, using the same light introducing portion (5) of the positioning rib (10) is a light guide portion (4) positioned in the longitudinal direction. Further, the light guide portion (4) formed in a substantially rod shape in cross section having four sides perpendicular to the longitudinal direction of the light guide portion (4), the portion forming the light guiding lens (4a) on one surface, the facing surface is formed on a diffusion blocking portion (7).