A head device for a mop according to the present invention can be configured to comprise: an upper case on which a bar for a mop is installed; a lower case which is inserted into the upper case; and an elastic member which is interposed between the upper case and the lower case and displaces the upper case and the lower case up and down. According to the present invention, it is possible to provide a head device for a mop which increases a normal force of the head device in order to facilitate cleaning of a floor.
