The present invention provides an electronic device with a secondary cell which has a simple structure and is capable of extending a continuous operating period by compensating for power consumption through effective utilization of a light source and external light. On a rear face of a casing 201 of a mobile phone, a light source 204, a conductive key sheet 203 having a plurality of operation keys 206 and a solar battery 202 are layered. Each of the operation keys 206 is exposed outwards through a through-hole 208 of the solar battery 202 and a through-hole 207 of the casing 201. The key sheet 203 guides the light from the light source 204 and the light from the outside of the casing 201 to the solar battery 202 and guides the light from the light source 204 onto the operation key 206. The solar battery 202 receives the light from the light source 204 and the outside of the casing 201 through the key sheet 203 and converts the light into electric energy to be charged into a secondary cell.