Abstract: In a food and drink circulating conveyer passage 1 disposed along an eating and drinking counter 3 for conveying and supplying food and drink, a tunnel unit 5 which has at least one side formed to a curved portion having a prescribed radius of curvature is disposed on the conveyer passage and slide rails 10 are disposed to guide the opening and closing doors along the curved portion in an up and down direction, wherein when the opening and closing doors have been moved to an upper position of the tunnel unit, they are disengaged from the slide rails and can be removed from the tunnel unit.