A portable electronic device includes a first chassis and a second chassis movably connected to one another, which can be opened away from one another and closed against one another, a magnetic recording device (a hard disk device) provided within the first chassis, and a wireless communication module (a non contact type IC module) provided within the second chassis. The portable electronic device can be operated in a mode #1 in which the operation of the non contact type IC module is permitted while the operation of the HDD section is prohibited, or in a mode #2 in which the operation of the non contact type IC module is prohibited while the operation of the HDD section is permitted. Since operation of the non contact type IC module is prohibited when the system is changed over from the mode #1 to the mode #2, accordingly the HDD section can perform reading or writing without experiencing any influence due to shock, magnetism, or electromagnetic waves.