PROBLEM TO BE SOLVED: To provide an information detection apparatus and an information detection method capable of discriminating whether or not the apparatus is attached normally to a measurement target, by a comparatively simple constitution.SOLUTION: The information detection apparatus comprises: irradiation means for irradiation with light reflection means which has a reflectance ratio different from that of a measurement target light receiving means for receiving return light of the irradiation light from a light emission part and discrimination means which, on the basis of a quantity of received light by the light receiving means, discriminates whether the return light has returned from the measurement target or the reflection means.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】比較的簡単な構成で、計測対象に対して正常に装置が取付けられているか否かを判別可能な情報検出器及び情報検出方法を提供する。【解決手段】情報検出器は、光を照射する照射手段と、計測対象とは異なる反射率を有する反射手段と、発光部から照射された光の戻り光を受光する受光手段と、受光手段における受光量に基づき、戻り光が、計測対象からの戻り光であるのか、又は反射手段からの戻り光であるのかを判別する判別手段とを備える。【選択図】図1
