Biosensor and method for detecting biomolecules by using the biosensor

A method for detecting biomolecules, comprising:

• preparing an analysis solution containing conjugates of analysis target molecules and probe molecules, and remainder probe molecules;
• supplying the analysis solution to a fluid channel of a biosensor including:
• a detection unit disposed on a substrate and having a surface to which detection target molecules binding specifically to probe molecules are immobilized;
• and the fluid channel configured to provide the analysis solution containing the probe molecules binding specifically to the detection target molecules and the analysis target molecules to the detection target molecules;
• binding the remainder probe molecules to the detection target molecules of the detection unit;
• and
• measuring an electrical conductance change in the detection unit.