Autonomous robot vacuum cleaner comprising: • a robot vacuum cleaner main body (10; 10A), comprising a housing (19; 19A), and at least one drive wheel, • a handheld vacuum cleaner (20; 20A), comprising autonomous suctioning means, and arranged to be reversibly coupled in the housing (19; 19A) of the main body (10; 10A): - so as to form the autonomous robot vacuum cleaner engaged with the main body (10; 10A), when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A), and - so as to form an autonomous handheld vacuum cleaner (20; 20A) when the handheld vacuum cleaner (20; 20A) is uncoupled from the main body (10; 10A), wherein the robot vacuum cleaner, when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A), has a peripheral wall defining a casing side surface, preferably substantially circular, wherein the handheld vacuum cleaner (20; 20A) comprises a handle (21; 21A) provided movable to occupy: - a retracted position, at least when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A), or - a deployed position, at least when the handheld vacuum cleaner (20; 20A) is uncoupled from the main body (10; 10A), to allow a user to handle the thus autonomous handheld vacuum cleaner (20; 20A), characterised in that the housing (19; 19A) leads to the casing side surface, and in that when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A) with the handle (21; 21A) in the retracted position, the handle (21; 21A) is tangent or withdrawn from the casing side surface. • a robot vacuum cleaner main body (10; 10A), comprising a housing (19; 19A), and at least one drive wheel, • a handheld vacuum cleaner (20; 20A), comprising autonomous suctioning means, and arranged to be reversibly coupled in the housing (19; 19A) of the main body (10; 10A): - so as to form the autonomous robot vacuum cleaner engaged with the main body (10; 10A), when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A), and - so as to form an autonomous handheld vacuum cleaner (20; 20A) when the handheld vacuum cleaner (20; 20A) is uncoupled from the main body (10; 10A), wherein the robot vacuum cleaner, when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A), has a peripheral wall defining a casing side surface, preferably substantially circular, wherein the handheld vacuum cleaner (20; 20A) comprises a handle (21; 21A) provided movable to occupy: - a retracted position, at least when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A), or - a deployed position, at least when the handheld vacuum cleaner (20; 20A) is uncoupled from the main body (10; 10A), to allow a user to handle the thus autonomous handheld vacuum cleaner (20; 20A), - so as to form the autonomous robot vacuum cleaner engaged with the main body (10; 10A), when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A), and - so as to form an autonomous handheld vacuum cleaner (20; 20A) when the handheld vacuum cleaner (20; 20A) is uncoupled from the main body (10; 10A), wherein the robot vacuum cleaner, when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A), has a peripheral wall defining a casing side surface, preferably substantially circular, - a retracted position, at least when the handheld vacuum cleaner (20; 20A) is coupled to the main body (10; 10A), or - a deployed position, at least when the handheld vacuum cleaner (20; 20A) is uncoupled from the main body (10; 10A), to allow a user to handle the thus autonomous handheld vacuum cleaner (20; 20A),