Light guide and illumination apparatus using the same

The invention provides a light guide for mitigating unevenness of light within each illumination area and an illumination apparatus using the same. The light guide (100) is composed of: a basic part (1) which is light transmissible, a first illumination area (1c) corresponding to a first light incidence part (1a) and a second illumination area (1d) corresponding to a second light incidence part (1b), a first slit area (1f) being formed at a bounder area (1e) between the first illumination area and the second illumination area, one of the first light incidence part and the second light incidence part being formed on a side opposite to the first slit area through the first illumination area or the second illumination area, wherein in the light guide, the first slit area has a first slit (1h) which extends intersecting a progressing direction of the light from a light source (LS) and has the intersecting angle with the light from the light source continuously varied, the width of the first slit going widened downwardly side or upwardly side.