Abstract: Herein disclosed is an electronic device which can have, without deteriorating the effect of notification by light, an extended area to have electronic parts mounted thereon at the portion of the main body 20 covered with the accessory exterior panel 30, the extended area being extended in size compared with the conventional electronic device, the electronic device available for a cellular phone. The cellular phone 10 comprises a main body 20, an accessory exterior panel 30 detachably mounted on the main body 20, and four screws 50 for fixing the accessory exterior panel 30 to the main body 20. The main body 20 has LEDs and a light guide plate 22c irradiated by the LEDs. The light guide plate 22c is positioned to emit a light to the inner portion of the accessory exterior panel 30 through the side surface 30a of the accessory exterior panel 30.