Abstract: A micro magnetic core memory having a magnetic core, which serves as a storage medium, a coil, which is located in close vicinity to the magnetic core and magnetizes the magnetic core, and a sensor, which is located in close vicinity to the magnetic core and detects polarity of magnetization of the magnetic core. The micro magnetic core memory has the effects in that the inputting and the outputting of information can be carried out quickly, in that a high degree of integration can be achieved easily and a storage device having a large capacity can be produced at a low cost, and in that the stored information is not lost when the supply of electric power is turned off.