A cleaner comprising: a mop module which includes a pair of spin mops (41a, 41b) that contact a floor while rotating and are left-right symmetric with respect to a virtual central vertical plane; a collection module that collects foreign substances from the floor and spaced apart from the mop module, the collection module including: at least one collection bin that forms a collection space which stores the collected foreign substances and is left-right symmetric with respect to the central vertical plane, and at least one sweeping roller which contacts the floor while rotating to move foreign substances from the floor into the collection space and is left-right symmetric with respect to the central vertical plane; a body which connects the mop module and the collection module; and a collection driving motor which provides torque to the at least one sweeping roller and is left-right symmetric with respect to the central vertical plane, wherein the body moves based on a rotation of the pair of spin mops (41a, 41b) and without a separate driving wheel, wherein the collection module further includes: a module cabinet having a bottom surface facing the floor; and at least one auxiliary wheel that spaces the floor and the bottom surface of the module cabinet apart from each other at a distance to position the at least one sweeping roller to contact the floor. a mop module which includes a pair of spin mops (41a, 41b) that contact a floor while rotating and are left-right symmetric with respect to a virtual central vertical plane; a collection module that collects foreign substances from the floor and spaced apart from the mop module, the collection module including: at least one collection bin that forms a collection space which stores the collected foreign substances and is left-right symmetric with respect to the central vertical plane, and at least one sweeping roller which contacts the floor while rotating to move foreign substances from the floor into the collection space and is left-right symmetric with respect to the central vertical plane; a body which connects the mop module and the collection module; and a collection driving motor which provides torque to the at least one sweeping roller and is left-right symmetric with respect to the central vertical plane, wherein the body moves based on a rotation of the pair of spin mops (41a, 41b) and without a separate driving wheel, wherein the collection module further includes: a module cabinet having a bottom surface facing the floor; and at least one auxiliary wheel that spaces the floor and the bottom surface of the module cabinet apart from each other at a distance to position the at least one sweeping roller to contact the floor. at least one collection bin that forms a collection space which stores the collected foreign substances and is left-right symmetric with respect to the central vertical plane, and at least one sweeping roller which contacts the floor while rotating to move foreign substances from the floor into the collection space and is left-right symmetric with respect to the central vertical plane; a body which connects the mop module and the collection module; and a collection driving motor which provides torque to the at least one sweeping roller and is left-right symmetric with respect to the central vertical plane, wherein the body moves based on a rotation of the pair of spin mops (41a, 41b) and without a separate driving wheel, wherein the collection module further includes: a module cabinet having a bottom surface facing the floor; and at least one auxiliary wheel that spaces the floor and the bottom surface of the module cabinet apart from each other at a distance to position the at least one sweeping roller to contact the floor. a module cabinet having a bottom surface facing the floor; and at least one auxiliary wheel that spaces the floor and the bottom surface of the module cabinet apart from each other at a distance to position the at least one sweeping roller to contact the floor.