Interior information display apparatus and light irradiation apparatus used for the same

Information is displayed by irradiating a visible light on a specific position based on at least one of vehicle state information, vehicle surrounding information, and vehicle interior information. For example, the visible light is irradiated on a target switch based on signals indicating an on/off state of a headlamp operation switch and an on/off state of a key switch. A user can easily confirm the target switch and unerringly operate the target switch. A visible light irradiator is arranged in a vehicle compartment and irradiates the visible light to display information in the vehicle compartment. The information can be provided for the user in a novel manner.