A cleaner , comprising: a cleaner main body having a controller; a support member detachably coupled to a module mounting portion of the cleaner main body ; and a mop module rotatably supported on the support member , wherein the mop module comprises: a rotating rod configured to be rotatable in at least one direction by being interlocked with a rotation driving portion provided in the module mounting portion when the support member is mounted on the module mounting portion ; and a mop member formed to surround an outer circumference of the rotating rod so as to mop the floor in response to the rotation of the rotating rod , wherein the rotating rod is provided with a water receiving portion formed therein, and wherein a water outlet communicating with the water receiving portion is formed through the outer circumference of the rotating rod , characterized in that the outer circumference of the rotating rod is divided into a first part having the water outlet and a second part (121") without the water outlet along the circumference, and wherein the controller is configured to stop the rotation of the rotating rod in a state where the first part is positioned above the second part (121") by using the sensing unit . a cleaner main body having a controller; a support member detachably coupled to a module mounting portion of the cleaner main body ; and a mop module rotatably supported on the support member , wherein the mop module comprises: a rotating rod configured to be rotatable in at least one direction by being interlocked with a rotation driving portion provided in the module mounting portion when the support member is mounted on the module mounting portion ; and a mop member formed to surround an outer circumference of the rotating rod so as to mop the floor in response to the rotation of the rotating rod , wherein the rotating rod is provided with a water receiving portion formed therein, and wherein a water outlet communicating with the water receiving portion is formed through the outer circumference of the rotating rod , characterized in that the outer circumference of the rotating rod is divided into a first part having the water outlet and a second part (121") without the water outlet along the circumference, and wherein the controller is configured to stop the rotation of the rotating rod in a state where the first part is positioned above the second part (121") by using the sensing unit . a rotating rod configured to be rotatable in at least one direction by being interlocked with a rotation driving portion provided in the module mounting portion when the support member is mounted on the module mounting portion ; and a mop member formed to surround an outer circumference of the rotating rod so as to mop the floor in response to the rotation of the rotating rod , wherein the rotating rod is provided with a water receiving portion formed therein, and wherein a water outlet communicating with the water receiving portion is formed through the outer circumference of the rotating rod , characterized in that the outer circumference of the rotating rod is divided into a first part having the water outlet and a second part (121") without the water outlet along the circumference, and wherein the controller is configured to stop the rotation of the rotating rod in a state where the first part is positioned above the second part (121") by using the sensing unit . <EOS>