Disinfection device and disinfection system

A disinfection system that disinfects an inside of a vehicle, the disinfection system comprising:

• a plurality of ultraviolet irradiators including a first ultraviolet irradiator positioned at a front portion of a passenger compartment of the vehicle and a second ultraviolet irradiator positioned at a rear portion of the passenger compartment of the vehicle;
• a recognition sensor that recognizes a situation of the inside of the vehicle, the recognition sensor including a camera;
• and
• a control device configured to automatically control the plurality of ultraviolet irradiators based on the situation of the inside of the vehicle, which is recognized by the recognition sensor, to disinfect the inside of the vehicle, wherein:
• the control device is configured to selectively switch on and off the plurality of ultraviolet irradiators, and
• the control device is configured to determine a first elapsed time since a previous irradiation by the first ultraviolet irradiator at the front portion relative to a first threshold time, and a second elapsed time since another previous irradiation by the second ultraviolet irradiator at the rear portion relative to the first threshold time.