The present invention provides a plant moisture movement state sensor capable of measuring the movement state of moisture flowing through the inside of a shoot end, peduncle, or other small plant part. A plant moisture movement state sensor is provided with a heater-equipped temperature probe (10) provided with a temperature sensor (11) and a heater (12), a temperature probe (20) provided with a temperature sensor (21), an electrical resistance probe (30) provided with electrodes (33) for electrical resistance measurement, and a support unit (80) for supporting the probes (10, 20, 30) in a state of parallel alignment. The location of a conducting vessel (XY) can be detected from the electrical resistance measured by the electrical resistance probe (30), and the temperature sensors (11, 21) can thus be accurately placed at the position of a sieve tube (PH) or the conducting vessel (XY). As a result, it is easy to attach a plant moisture movement state sensor (1) and the moisture movement state of a plant can be measured accurately.
