To easily and securely connect portable electronic equipment to external information processing equipment without impeding the size reduction of a portable information terminal device.

An external equipment connection adapter 700 holds the main body 200 of the portable electronic equipment and electrically connects its internal electronic circuit to a cable 81 led out of the external information processing equipment and a movable part 73 is energized toward the main body 200 mounted on a slide plate 71 with the elastic forces of coil springs 731 and 731 put in the space part in the movable part 73. Here, substrate terminals 253... stood on the circuit board 251 of the main body 200 and pins 711... that a fixed part 71 has are electrically connected and the circuit board 251 and the cable terminal 83 of the cable 81 are electrically connected. The movable part 73 can easily be moved away from the main body 200 by applying a specific force exceeding the elastic forces of the coil springs 731 and 731.