Patent ID: 7212124

Claim:
A portable information device comprising: a case; electronic devices stored in the case; a flattened battery for supplying electric power to the portable information device, said battery being made of a metal material; a battery cover; an antenna coil formed on a substrate; a magnetic material sheet; and an IC and condensers for resonance connected to the antenna coil; wherein: the IC intercommunicates with an external apparatus through the antenna coil using a magnetic field, a depression serving as a battery receiving section is formed on a portion of the surface of the case and covered by the battery cover, the battery, the antenna coil, and the magnetic material sheet are stored in the depression, a metal vacuum-evaporation film or a conductive material coating is applied to the case, no metal vacuum-evaporation film or a conductive material coating is applied to the battery cover, the antenna coil is arranged between the battery cover and the battery, and the magnetic material sheet is arranged between the antenna coil and the battery within the depression.