An object centering device configured to center a conveyed food container includes a restricting guide member having a pair of guide surfaces facing the food container and configured to be respectively in contact with at least a pair of opposed contact portions. The pair of guide surfaces of the restricting guide member includes front end portions that extend away from each other toward a downstream side of a conveyance direction of the food container. The front end portions are configured such that an angle formed by the pair of guide surfaces is changeable.