Illumination device

[Object] To provide an illumination device that can make it difficult to exert an influence of a heat ray emitted from a light-emitting part on a human body sensor part, that can secure a detection area of the human body sensor part appropriate for a light distribution area where light from the light-emitting part is distributed, that can ensure high workability, and that can suppress cost increase. [Means for Settlement] In an illumination device, a detection angle ± that is an angle formed between a normal line L1 of a plane passing through a center of a light-receiving surface of a pyroelectric sensor element (sensor element) included in a human body sensor part 216 and including one surface of a circuit substrate 211 and a first straight line L2 connecting the center of the light-receiving surface of the pyroelectric sensor element to an outer circumference of a detection area on a floor surface is set to be greater than a half angle ² that is an angle formed between an optical axis L3 of each light-emitting part 213 and a second straight line L4 extending in a radiation direction of light emitted from each of the light-emitting parts 213 and having a radiation intensity as half as the maximum radiation intensity so that the detection area of the human body sensor part 216 arranged at a position away from the floor surface on the floor surface includes entirety of a light distribution area of each light-emitting part 213.