A robot cleaner includes a body forming an external appearance of the robot cleaner, a body moving part provided to the body to move the body, a body driving unit to drive the body moving part, a dust collector to capture suctioned foreign substances and provided with a first chamber and a second chamber communicating with the first chamber, a suction generation unit to supply suction force to the dust collector, and a guide member to guide the foreign substances captured in the first chamber to the second chamber and to apply pressure to the foreign substances in the second chamber in order to compress the foreign substances.