PROBLEM TO BE SOLVED: To provide a plant moisture dynamic sensor capable of measuring the moisture dynamic state flowing through a plant fine part such as a new treetop end, a stem, or the like.SOLUTION: The plant moisture dynamic sensor includes: a heater-equipped temperature probe 10 having a temperature sensor 11 and a heater 12; a temperature probe 20 having a temperature sensor 21; an electric resistance probe 30 having an electrode 33 for electric resistance measurement; and a support unit 80 for supporting the probes 10, 20, and 30 in parallel. The position of a duct XY can be detected from the electric resistance measured by the electric resistance probe 30, so that the temperature sensors 11 and 21 can be accurately disposed at the position of a phloem PH or the duct XY. Therefore, the plant moisture dynamic sensor 1 can be easily attached, and the moisture dynamic state of a plant can be accurately measured.
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