An interface unit for a cooking device having a cavity on which a cooking material is placed, comprising: a frame having a front surface and a rear surface; a main printed circuit board placed on the rear surface of the frame; at least one auxiliary printed circuit board (27, 28) placed on the front surface of the frame; an LED mounted on at least one of the auxiliary printed circuit board (27, 28); and a glass placed in at least one front of the LED and contacted to a user, wherein the interface unit for a cooking device further comprises, at least one reflector (30, 38) placed in the front of the auxiliary printed circuit board (27, 28) to guide the emitting light of the LED; a capacitance recognizing unit provided on the rear surface of the glass in order to receive an input of the user when the glass contacts the user; and a display panel holder in order to safely seat the display panel in the frame, the display panel holder comprises: a buffer unit to elastically support the display panel against outside impact; and a coupling member preventing the separation of the display panel through the supporting action by the buffer unit, characterized in that the interface unit further comprises a display panel electrically connected to the main printed circuit board and provided with a plurality of vacuum fluorescent displays; and in that the buffer unit comprises: a flexible bar formed with a protruding part so that it is contacted to the display panel; and a cutout hole having the flexible bar whose circumference part is cutout in order to give the elasticity to the flexible bar. a frame having a front surface and a rear surface; a main printed circuit board placed on the rear surface of the frame; at least one auxiliary printed circuit board (27, 28) placed on the front surface of the frame; an LED mounted on at least one of the auxiliary printed circuit board (27, 28); and a glass placed in at least one front of the LED and contacted to a user, wherein the interface unit for a cooking device further comprises, at least one reflector (30, 38) placed in the front of the auxiliary printed circuit board (27, 28) to guide the emitting light of the LED; a capacitance recognizing unit provided on the rear surface of the glass in order to receive an input of the user when the glass contacts the user; and a display panel holder in order to safely seat the display panel in the frame, the display panel holder comprises: a buffer unit to elastically support the display panel against outside impact; and a coupling member preventing the separation of the display panel through the supporting action by the buffer unit, characterized in that the interface unit further comprises a display panel electrically connected to the main printed circuit board and provided with a plurality of vacuum fluorescent displays; and in that the buffer unit comprises: a flexible bar formed with a protruding part so that it is contacted to the display panel; and a cutout hole having the flexible bar whose circumference part is cutout in order to give the elasticity to the flexible bar. a buffer unit to elastically support the display panel against outside impact; and a coupling member preventing the separation of the display panel through the supporting action by the buffer unit, characterized in that the interface unit further comprises a display panel electrically connected to the main printed circuit board and provided with a plurality of vacuum fluorescent displays; and in that the buffer unit comprises: a flexible bar formed with a protruding part so that it is contacted to the display panel; and a cutout hole having the flexible bar whose circumference part is cutout in order to give the elasticity to the flexible bar. a flexible bar formed with a protruding part so that it is contacted to the display panel; and a cutout hole having the flexible bar whose circumference part is cutout in order to give the elasticity to the flexible bar.