PROBLEM TO BE SOLVED: To provide a terahertz wave generating element and the like which are capable of generating a terahertz wave with a comparatively high intensity by taking out terahertz waves generated from a plurality of positions with equiphase surfaces approximately superposed one over the other.SOLUTION: A terahertz wave is generated using terahertz waves generated in first and second optical waveguides (100) and (200) including an electro-optic crystal. In a generation position of the first optical waveguide where a second terahertz wave (9) is generated by exciting light (10), arrival at the generation position of a first terahertz wave (8) generated in the second optical waveguide by exciting light and generation of the second terahertz wave (9) in the generation position are approximately synchronized with each other. Therefore, a first equiphase surface (13) of the first terahertz wave and a second equiphase surface (14) of the second terahertz wave are approximately superposed one over the other.
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