A food plate carrier which is suitable for being carried and for being put on a conveyor line of a conveying system, and for being carried via the conveyor line to transport food to tables and seats in a restaurant, the food plate carrier comprising: a mounting platform having a plate resting portion for putting thereon a plate on which food is put, a cap member which is attached to the mounting platform in such a manner as to open and close with respect to the plate resting portion and also in such a manner as to swing to cover the plate resting portion of the mounting platform, and an open and close mechanism suitable for, when in use, allowing the cap member to close when the plate is rested on the plate resting portion and open when the plate is removed therefrom, said open and close mechanism comprising: an actuator mounted on the plate resting portion of the mounting platform in such a manner as to be moved in a back and forth direction, in which, when said actuator in use is being brought into abutment with the plate, said actuator is being put into action to move relative to the plate resting portion connecting means (84, 85, 75) to connect the actuator with the cap member so that the movement of the actuator is transmitted to the cap member so that the cap member is actuated to move in the closing direction with a rearward movement of the actuator, and that the cap member is actuated in an opening direction with a forward movement of the actuator, and biasing means for biasing the cap member forwardly toward its opened position. a mounting platform having a plate resting portion for putting thereon a plate on which food is put, a cap member which is attached to the mounting platform in such a manner as to open and close with respect to the plate resting portion and also in such a manner as to swing to cover the plate resting portion of the mounting platform, and an open and close mechanism suitable for, when in use, allowing the cap member to close when the plate is rested on the plate resting portion and open when the plate is removed therefrom, said open and close mechanism comprising: an actuator mounted on the plate resting portion of the mounting platform in such a manner as to be moved in a back and forth direction, in which, when said actuator in use is being brought into abutment with the plate, said actuator is being put into action to move relative to the plate resting portion connecting means (84, 85, 75) to connect the actuator with the cap member so that the movement of the actuator is transmitted to the cap member so that the cap member is actuated to move in the closing direction with a rearward movement of the actuator, and that the cap member is actuated in an opening direction with a forward movement of the actuator, and biasing means for biasing the cap member forwardly toward its opened position. an actuator mounted on the plate resting portion of the mounting platform in such a manner as to be moved in a back and forth direction, in which, when said actuator in use is being brought into abutment with the plate, said actuator is being put into action to move relative to the plate resting portion connecting means (84, 85, 75) to connect the actuator with the cap member so that the movement of the actuator is transmitted to the cap member so that the cap member is actuated to move in the closing direction with a rearward movement of the actuator, and that the cap member is actuated in an opening direction with a forward movement of the actuator, and biasing means for biasing the cap member forwardly toward its opened position.