Stair missing protection device and passenger transportation device comprising same

According to the first aspect of the invention, the step missing protection device for the passenger transportation device is provided, the step missing protection device comprises a sensor and a controller, the sensor comprises a transmitting end and two receiving ends arranged side by side, and the transmitting end and the receiving ends are arranged on the two sides of a horizontal section of a truss of the passenger transportation device respectively and face each other, the transmitting end and the receiving end are arranged at the same horizontal height and are positioned below the upper surface of the step; when the passenger transportation device runs, the transmitting end of the sensor sends signals to the receiving ends, and if the two receiving ends receive the signals sent by the transmitting end at the same time, the controller sends a shutdown instruction to enable the passenger transportation device to stop running. According to the second aspect of the invention, the invention further provides