An electric vacuum cleaner comprising: an autonomous robotic vacuum cleaning unit autonomously moving on a surface to be cleaned and collecting dust on the surface; and a station unit , characterized in that the autonomous robotic vacuum cleaning unit includes: a body case having a suction port and a dust container opening at a bottom wall of the body case; and a primary dust container including a container body detachably provided in the body case, accumulating the dust collected through the suction port by the autonomous robotic vacuum cleaning unit and having a bottom face covered by the bottom wall of the body case, a connecting part exposed from the dust container opening or facing the dust container opening in a state attached to the body case, a disposal port provided on the connecting part and through which the dust in the container body is discharged, and a disposal lid for opening and closing the disposal port; and the station unit includes: a dust transfer pipe through the dust container opening and connected to the disposal port in contact with the connecting part of the primary dust container; and a secondary dust container for accumulating the dust discharged from the primary dust container through the dust transfer pipe, wherein the disposal port is provided on the bottom wall of the container body and is opened downward of the autonomous robotic vacuum cleaning unit, and wherein the dust transfer pipe is opened upward of the station unit . an autonomous robotic vacuum cleaning unit autonomously moving on a surface to be cleaned and collecting dust on the surface; and a station unit , characterized in that the autonomous robotic vacuum cleaning unit includes: a body case having a suction port and a dust container opening at a bottom wall of the body case; and a primary dust container including a container body detachably provided in the body case, accumulating the dust collected through the suction port by the autonomous robotic vacuum cleaning unit and having a bottom face covered by the bottom wall of the body case, a connecting part exposed from the dust container opening or facing the dust container opening in a state attached to the body case, a disposal port provided on the connecting part and through which the dust in the container body is discharged, and a disposal lid for opening and closing the disposal port; and a body case having a suction port and a dust container opening at a bottom wall of the body case; and a primary dust container including a container body detachably provided in the body case, accumulating the dust collected through the suction port by the autonomous robotic vacuum cleaning unit and having a bottom face covered by the bottom wall of the body case, a connecting part exposed from the dust container opening or facing the dust container opening in a state attached to the body case, a disposal port provided on the connecting part and through which the dust in the container body is discharged, and a disposal lid for opening and closing the disposal port; and the station unit includes: a dust transfer pipe through the dust container opening and connected to the disposal port in contact with the connecting part of the primary dust container; and a secondary dust container for accumulating the dust discharged from the primary dust container through the dust transfer pipe, a dust transfer pipe through the dust container opening and connected to the disposal port in contact with the connecting part of the primary dust container; and a secondary dust container for accumulating the dust discharged from the primary dust container through the dust transfer pipe, wherein the disposal port is provided on the bottom wall of the container body and is opened downward of the autonomous robotic vacuum cleaning unit, and wherein the dust transfer pipe is opened upward of the station unit . <EOS>