The invention relates to a dishwasher comprising a washing station (2) and a rinsing station (3) defining a tunnel (4). A conveyor (5) is provided in the tunnel (4) and is capable of transferring the dishes from one station to the other. At least one of the stations includes a sump (13) having side walls (21) connected to a runoff surface (11) and a lowest point (36) connected to a pipe (14). Between the lowest point (36) and the side walls (21), the sump (13) includes a rounded-shape body (38) having the shape of a cup along a vertical plane.
