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 including a charging electrode to charge the autonomous robotic vacuum cleaning unit, wherein the autonomous robotic vacuum cleaning unit includes: a body case ; and a primary dust container including a container body provided in the body case and accumulating the dust collected by the autonomous robotic vacuum cleaning unit, a disposal port through which the dust in the container body is discharged, and a disposal lid for opening and closing the disposal port; and the station includes: a dust transfer pipe that is connectable to the disposal port of the primary dust container; a lever that hooks to the disposal lid when the autonomous robotic vacuum cleaning unit returns to the station, and opening the disposal lid so as to fluidically connecting the disposal port and the dust transfer pipe to each other; and a secondary dust container accumulating the dust discharged from the primary dust container through the dust transfer pipe, characterized in that the disposal lid Z and the lever swing around a rotation center line (C3) crossing a direction toward a home position where the dust transfer pipe is connected to the disposal port of the primary dust container . an autonomous robotic vacuum cleaning unit autonomously moving on a surface to be cleaned and collecting dust on the surface; and a station including a charging electrode to charge the autonomous robotic vacuum cleaning unit, the autonomous robotic vacuum cleaning unit includes: a body case ; and a primary dust container including a container body provided in the body case and accumulating the dust collected by the autonomous robotic vacuum cleaning unit, a disposal port 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 ; and a primary dust container including a container body provided in the body case and accumulating the dust collected by the autonomous robotic vacuum cleaning unit, a disposal port through which the dust in the container body is discharged, and a disposal lid for opening and closing the disposal port; and the station includes: a dust transfer pipe that is connectable to the disposal port of the primary dust container; a lever that hooks to the disposal lid when the autonomous robotic vacuum cleaning unit returns to the station, and opening the disposal lid so as to fluidically connecting the disposal port and the dust transfer pipe to each other; and a secondary dust container accumulating the dust discharged from the primary dust container through the dust transfer pipe, characterized in that the disposal lid Z and the lever swing around a rotation center line (C3) crossing a dust transfer pipe that is connectable to the disposal port of the primary dust container; a lever that hooks to the disposal lid when the autonomous robotic vacuum cleaning unit returns to the station, and opening the disposal lid so as to fluidically connecting the disposal port and the dust transfer pipe to each other; and a secondary dust container accumulating the dust discharged from the primary dust container through the dust transfer pipe, characterized in that the disposal lid Z and the lever swing around a rotation center line (C3) crossing a direction toward a home position where the dust transfer pipe is connected to the disposal port of the primary dust container . <EOS>