This invention relates to an individual-identifying apparatus in which a plurality of output electrodes are arranged at regular intervals in a direction perpendicular to a longitudinal direction of a finger, a single input electrode is arranged at an end along the direction in which the output electrodes are arranged, the output of an oscillator which outputs a signal of a predetermined frequency is sequentially supplied to the output electrodes via an analog switch group, an electric signal output from the input electrode is detected by a phase detecting circuit, and the output of the circuit is converted to a digital signal by an A/D converter, thereby detecting the irregularity pattern of the finger to identify an individual. This individual-identifying apparatus can perform stable individual identification which is not easily influenced by the surface state of the finger, for example, whether or not it is damp, or by outside noise.