An air cleaner that filters air supplied into an engine may include a lower case that has an intake port through which external air flows inside, a filter that may be disposed in the lower case and filters and allows the air flowing inside through the intake port, and an upper case that may be coupled to an upper portion of the lower case and has an exhaust pipe to discharge the air filtered by the filter to the engine, wherein an inlet of the exhaust pipe may be formed inside the upper case and an outlet may be formed to be connected to the outside of the upper case, the inlet of the exhaust pipe may be divided into a first inlet and a second inlet, and a fan that controls the exhaust amount of air to the outlet of the exhaust pipe may be disposed in the second inlet.