An air purifier includes: a body providing an internal space; a plurality of fan units arranged to be spaced apart from each other in an up-down direction in the internal space of the body and configured to provide a blowing force for drawing air into the internal space of the body; and a plurality of filter units arranged in the up-down direction between the plurality of fan units to filter air introduced into the internal space of the body. The plurality of fan units include: a first fan unit disposed above the plurality of filter units and configured to provide a blowing force for causing air filtered by one of the plurality of filter units to flow upward; and a second fan unit disposed below the plurality of filter units and configured to provide a blowing force for causing air filtered by another one of the plurality of filter units to flow downward.