Provided is a three-dimensional measurement method and a three-dimensional measurement device preventing increase in data amount and processing load and providing a highly precise measurement result. According to a three-dimensional measurement method for performing three-dimensional measurement on a desired measurement range H in an oral cavity, a re-measurement start position Rs, at which re-measurement on measurement information-insufficient sites Lm and Ln is to be started, is displayed； re-measurement is performed on an area starting from the re-measurement start position Rs and encompassing the measurement information-insufficient sites Lm and Ln； and a characteristic site in the re-measurement information acquired by the re-measurement and a characteristic site in measurement information are adapted to each other to create three-dimensional measurement information on the measurement range H. The measurement information-insufficient sites Lm and Ln are detected in a measurement information-insufficient site detection process (step s6) of detecting the measurement information-insufficient sites Lm and Ln, for which measurement information acquired in a three-dimensional measurement step (step s5) is insufficient. The three-dimensional measurement step is of performing three-dimensional measurement on a measurement range H.
