Door opening and closing controller

A door opening and closing controller comprising:

• a processor coupled to a memory storing instructions for the processor to function as:
• a time difference acquisition part that acquires a time difference from a current time to a scheduled departure time at which a shared vehicle, which performs automatic traveling on the basis of a predetermined operation plan, departs from a shared vehicle stop, when the shared vehicle is stopped at the shared vehicle stop;
• a region adjusting part that adjusts a detection region for detecting people around the shared vehicle with a sensor mounted on the shared vehicle before the scheduled departure time;
• a people flow determination part that determines a people flow before the scheduled departure time in the adjusted detection region;
• and
• an opening and closing control part that controls a closing operation of closing an entry/exit door of the shared vehicle on the basis of the people flow that has been determined, wherein
• the region adjusting part narrows the detection region as the current time approaches the scheduled departure time.