The present disclosure relates to a clothing treating apparatus comprising: an outer case which includes a first opening formed at the front side thereof; an inner case which is provided inside the outer case and has a space formed therein to receive clothes; an inner case bottom surface which forms the bottom of the inner case; a first penetrating part which extends through the inner case bottom surface; and a first machinery room forming surface which forms a machinery room disposed under the inner case and separated from the inner case, and provides a holding surface that protrudes to enable a steam nozzle to be installed thereon.