A cleaner that includes: a main body; a suction assembly; and a coupling hose, wherein the main body includes: an air suctioning device, a case, a driving motor that is coupled to a first surface of the case and that is configured to generate driving force, a traveling wheel that is coupled to the first surface of the case and that is configured to rotate based on driving force generated by the driving motor, a motor cover that is configured to cover the driving motor such that the driving motor is located in a space between the first surface of the case and the motor cover, a rotating shaft that is coupled to the driving motor and that is configured to transfer driving force generated by the driving motor to the traveling wheel, and a coupling unit that couples the rotating shaft to the traveling wheel is disclosed.