The present application relates to a clothing treatment device, comprising: a cabinet having a mounting panel in which a panel inlet and a button mounting part are formed; a drum provided inside the cabinet to be rotatable and to accommodate clothes, the drum having a drum inlet communicating with the panel inlet; a button body located in the button mounting part, exposed to the outside of the cabinet and provided so that a user's body can make contact therewith; and a button extending from an edge of the button body and including a button extension body located inside the cabinet.