To provide a personal identification system which can increase security level more and whose security can hardly be broken so long as the person himself or herself who is alive does not operate it directly.

Speech information of an object person to be authenticated is detected by both a bone conduction sound detection part 340 and an air duct sound detection part 304 to perform identification processing based upon both their bone conduction speech information and air duct speech information. Feature information which can not be known with a bone conduction sound or air duct sound alone and originates from differences between both the waveforms can be grasped to greatly increase the security level of the personal identification. The bone conduction speech information and air duct speech information are homogeneous speech information in terms of information kind, so processes by hardware and software can easily be made common and the feature information originating from the differences between the waveforms can easily be extracted through operations.

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