A laundry device comprising: a case defining the outer appearance of the laundry device; a drum provided in the case and configured to receive laundry therein; a control panel provided at a side of the case; and a button assembly provided at the control panel, the button assembly comprises: a plurality of buttons (220, 620); and a display portion (240, 650) provided on each of the buttons (220, 650) and used to display the selected operating option, wherein the operating options are classified into primary operating options and a plurality of subordinate operating options belonging to each of the primary operating options, a series of buttons (220, 620) are provided to select a subordinate operating option as one of primary operating options, and each button corresponds to a specific subordinate operating option in a one to one ratio, characterized in that the plurality of buttons (220, 620) are integrated with one another to constitute a single button assembly, the buttons (220, 620) being exposed to the outside from a front surface of the control panel, so as to be pressed manually for the selection of operating options, and wherein the button assembly further comprises a frame located at a rear surface of the control panel and configured to integrally connect the plurality of buttons (220, 620) therein, and wherein the plurality of buttons may have an array of 4 X 4. a case defining the outer appearance of the laundry device; a drum provided in the case and configured to receive laundry therein; a control panel provided at a side of the case; and a button assembly provided at the control panel, the button assembly comprises: a plurality of buttons (220, 620); and a display portion (240, 650) provided on each of the buttons (220, 650) and used to display the selected operating option, wherein the operating options are classified into primary operating options and a plurality of subordinate operating options belonging to each of the primary operating options, a series of buttons (220, 620) are provided to select a subordinate operating option as one of primary operating options, and each button corresponds to a specific subordinate operating option in a one to one ratio, characterized in that the plurality of buttons (220, 620) are integrated with one another to constitute a single button assembly, the buttons (220, 620) being exposed to the outside from a front surface of the control panel, so as to be pressed manually for the selection of operating options, and wherein the button assembly further comprises a frame located at a rear surface of the control panel and configured to integrally connect the plurality of buttons (220, 620) therein, and wherein the plurality of buttons may have an array of 4 X 4. a plurality of buttons (220, 620); and a display portion (240, 650) provided on each of the buttons (220, 650) and used to display the selected operating option, wherein the operating options are classified into primary operating options and a plurality of subordinate operating options belonging to each of the primary operating options, a series of buttons (220, 620) are provided to select a subordinate operating option as one of primary operating options, and each button corresponds to a specific subordinate operating option in a one to one ratio, characterized in that the plurality of buttons (220, 620) are integrated with one another to constitute a single button assembly, the buttons (220, 620) being exposed to the outside from a front surface of the control panel, so as to be pressed manually for the selection of operating options, and wherein the button assembly further comprises a frame located at a rear surface of the control panel and configured to integrally connect the plurality of buttons (220, 620) therein, and wherein the plurality of buttons may have an array of 4 X 4.