rhe present invention relates to a clothes treatment apparatus comprising: an outer case having a first opening of which the front is open; an inner case provided inside the outer case; a machine room forming part positioned at the lower part of the inner case so as to form a machine room separated from the inner case; a foaming space formed between the outer case and the machine room forming part; foamed plastics filled in the foaming space; and strength reinforcing parts positioned at both side surfaces of the outer case in the foaming space so as to reinforce the strength of the outer case.