To prevent a shutter chance from being lost due to a memory capacity shortage or a depleted battery by integrating the memory and the battery so as to reduce the trouble of replacement.

A terminal 14 of a memory section 10 and a connector 21 of a battery section 20 are connected to integrate the memory section 10 and the battery section 20. The battery section 20 supplies power required for the memory section 10 and also supplies power required for an information device via a multiconnector 11. A switch is placed at the recess of an output switch hole 21, which closes only when a memory device 1 with the battery is loaded to the information device. Furthermore, a discrimination hole 22 is used to classify a primary battery from a secondary battery.