Disclosed is a robot cleaner. The robot cleaner includes a cleaner main body defining an external appearance of the robot cleaner, a fan unit mounted in the cleaner main body for generating suction force, a suction unit provided in the cleaner main body and having a suction port for suctioning air containing dust via driving of the fan unit and a first discharge port and a second discharge port for discharging the air containing the dust, a first guide member coupled to the first discharge port, a second guide member coupled to the second discharge port, and a cyclone unit for separating the dust from the air suctioned through the suction port using centrifugal force, the cyclone unit having a first communication hole for communicating with the first guide member and a second communication hole for communicating with the second guide member.