An air cleaner A includes: a portable casing 1 that includes therein an air trunk R having an inlet 11 and an outlet 42； blowing means 44 that is provided in the casing 1 and blows indoor air introduced from the inlet 11 into the air trunk R from the outlet 42； a deodorizing element 62 that is provided to interrupt the air trunk R, and through which the air introduced into the air trunk R passes； and control means 47 that controls an operation of the blowing means 44, wherein the deodorizing element 62 includes a catalyst that adsorbs an ammonia component in the air introduced into the air trunk R and collects the ammonia component from the air, and the control means 47 controls the blowing means 44 so that a flow rate of the air passing through the deodorizing element 62 is a predetermined value or less, and thus the deodorizing element collects at least 70% of the ammonia component in the indoor air introduced into the air trunk R.
