An operation control apparatus (100) that controls a changeover from an automatic operation mode in which a vehicle (10) is automatically operated to a manual operation mode in which the vehicle (10) is manually operated, the vehicle (10) includes a parking lock mechanism (24), and a sensor (110), the operation control apparatus (100) includes an electronic control unit (101) configured to: i) control the vehicle (10) such that the vehicle (10) is automatically operated, based on information received from the sensor (110); ii) determine whether or not a first condition is established; and iii) activate the parking lock mechanism (24), and change over an operation mode of the vehicle (10) from the automatic operation mode to the manual operation mode after establishing the parking lock state, when the first condition is not established. The first condition is that the automatic operation mode can be continued.