an electronic information storage device includes a first casing provided with a first toothed portion ; a pushing element ; an outer gear coupled to the pushing element ; and an electrical connecting portion having a circuit board mounting means and a circuit board , the circuit board mounting means being coupled to the circuit board , the circuit board mounting means being provided with a second toothed portion , wherein the outer gear is coupled to the first toothed portion and the second toothed portion respectively , so that the electrical connecting portion is driven with respect to the first casing when the pushing element pushes or pulls the outer gear . via this arrangement , the moving distance of the electrical connecting portion can be further controlled , thereby improving the convenience of the storage device in use .