To irradiate downward light making various angles against a horizontal face.

In an LED illumination device 10, in which an LED light source 1a1 is mounted on a substrate 2a so that a light axis 1a1' of the LED light source 1a1 becomes perpendicular to the plate-like substrate 2a perpendicular to the horizontal face, light from an incident face 3a1a of a light guide lens 3a is refracted by an emitting part 3a1d1, and irradiated as the downward light making a third angle against the horizontal face, light from a reflecting face 3a1c is refracted by the emitting part 3a1d2, and irradiated as the downward light making a fourth angle smaller than the third angle against the horizontal face, light from the incident face 3a1a is reflected by the emitting part 3a1e1, and irradiated as the downward light making a fifth angle larger than the third angle and the fourth angle against the horizontal face, and light from the reflecting face 3a1c is reflected by the emitting part 3a1e2, and irradiated as the downward light making a sixth angle larger than the third angle, the fourth angle and the fifth angle against the horizontal face.