Detection of detection target substances at a sensor portion is expedited and the efficiency thereof is improved in biological substance analysis, to enable accelerated analysis with high sensitivity. A biological substance analyzing cell equipped with a reaction chamber having a sample supply space, an acoustic matching layer which is provided at a predetermined region of an inner wall of the reaction chamber that faces another inner wall, and a sensor portion provided within the reaction chamber is employed. Ultrasonic waves are emitted such that a standing wave are generated between the acoustic matching layer and the inner wall of the reaction chamber that faces the acoustic matching layer. The detection target substance is concentrated by the capturing forces of the standing waves, and the concentrated detection target substance is detected at the sensor portion.
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