A terahertz wave characteristic measurement method comprises irradiating terahertz waves at a region of a target solution in which a thickness of the solution is in the range from 10 µm to 100 µm such that a propagation direction of the terahertz waves is in a thickness direction of the solution, the solution containing at least one type of target substance to be measured, and measuring at least one of a spectral characteristic and an intensity at a particular frequency or a particular wavelength of the terahertz waves that are one of transmitted through the region and reflected from the region.
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