Various types of interior illumination apparatus have been known as an interior illumination apparatus used for vehicles and the like. For example, JP-A 2012-86842 discloses an interior illumination apparatus in which a base, and a skin layer that is formed by staking a fabric on the base are provided, and a light source is disposed in a recess or the like that is formed in the base on the side of the skin layer.
An illumination apparatus that improves effects of light during nighttime has also been known. For example, JP-A 2009-101840 discloses a vehicular illumination apparatus in which a translucent core material, a translucent skin material, a film that has a design pattern and is disposed between the core material and the skin material, and an illumination unit that is disposed on the side of the core material, and the vehicular illumination apparatus is configured so that the design pattern of the film appears on the skin material utilizing light that has been emitted from the illumination unit and has passed through the core material.