A cleaner includes a battery which is detachable from a main body, a printed circuit board (PCB) provided in the main body, a first connector provided on the PCB and including a first terminal portion, a second connector provided in the battery and including a second terminal portion coupled to the first terminal portion when the battery is mounted onto a battery mounting portion, and a heat dissipation structure provided on the PCB and configured to dissipate heat from the first terminal portion. The heat dissipation structure including a heat dissipation pad provided on the PCB and a plurality of heat dissipation patterns arranged two-dimensionally on the heat dissipation pad.