Door opening and closing apparatus

A door opening and closing apparatus for opening and closing a door, comprising:

• an actuator that moves the door in an opening direction and a closing direction;
• and
• a lock mechanism that holds the door in a fully closed state, and has an engaging member which engages with a lock member provided in the door when in the fully closed state, and a link mechanism which has a plurality of link members, is configured to switch between a first state and a second state, and restricts rotation of the engaging member by being brought into the first state,
• wherein the link mechanism has a first face that is formed in one of the link members and is pressed by a projecting shaft moved by the actuator in order that the link mechanism changes from the first state to the second state, and a second face that is formed in one of the link members and is pressed by the projecting shaft in order that the link mechanism changes from the second state to the first state, and
• the first face and the second face form an L-shaped face, and are provided so as to have a positional relationship in which the first face and the second face of the L-shaped face intersect each other.