disclosed is a biopolymer detector capable of performing overall analysis including an unreacted sample without needing any complex work such as washing or the like . a dna probe 66 is fixed to an electrode plate 22 , and the electrode plate 22 is displaced by applying a dc voltage between electrode plates 22 and 23 . thus , sample dna 63 to be detected can be separated . it becomes possible to obtain a clearer result by performing analysis based on a ratio of an entire reaction system .