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We propose a novel device relying on a membrane used in life sciences for analyzing the terahertz (THz)-wave transmission characteristics of biomolecular samples. This device allows small amounts of sample to be prepared easier than current methods. We prepared several sugar samples adsorbed on the membrane, and measured them using THz time domain spectroscopy. The THz absorption data were found to be different depending on the concentration of samples, which demonstrates the potential of the membrane device in THz-wave biosensing applications.