Abstract: The present invention relates to an improvement of a capacitive data card in which a fuse is built in a circuit of the card and a data bit is represented by a state of the fuse and to a reader of the capacitive data card. An object of the present invention is to provide a capacitive data card having high utility value and high reliability and a reader thereof. The capacitive data card comprises a capacitive memory area for storing bits relative to capacitive data in accordance with a resistance state of a fuse which is built in a circuit of the card, that is, a state for flowing an electric current through the circuit is set when the fuse is intact, and resistance of the circuit is substantially increased when the fuse blows out, and a magnetic memory area for storing magnetic data.