A three-dimensional measurement method for performing three-dimensional measurement on a desired measurement range in an oral cavity, the method comprising: a three-dimensional measurement step of performing the three-dimensional measurement on the measurement range; an insufficient site detection step of detecting a measurement information-insufficient site (Lm, Ln) for which measurement information is insufficient in a measurement result acquired in the three-dimensional measurement step; a re-measurement start position notification step (s9A) of notifying a re-measurement start position (Rs) at which re-measurement on the measurement information-insufficient site (Lm, Ln) detected in the insufficient site detection step is to be started; a re-measurement step of re-measuring an area starting from the re-measurement start position (Rs) and encompassing the measurement information-insufficient site (Lm, Ln); a three-dimensional measurement information creation step of adapting at least one characteristic site having characteristic information in a re-measurement result acquired by the re-measurement performed in the re-measurement step, and at least one characteristic site having characteristic information in the measurement result acquired in the three-dimensional measurement step, to each other to create three-dimensional measurement information on the measurement range; and a re-measurement start position specification step (s9A) of detecting a highly adaptable characteristic site among the at least one characteristic site based on the measurement result acquired in the three-dimensional measurement step and specifying the highly adaptable characteristic site as the re-measurement start position. a three-dimensional measurement step of performing the three-dimensional measurement on the measurement range; an insufficient site detection step of detecting a measurement information-insufficient site (Lm, Ln) for which measurement information is insufficient in a measurement result acquired in the three-dimensional measurement step; a re-measurement start position notification step (s9A) of notifying a re-measurement start position (Rs) at which re-measurement on the measurement information-insufficient site (Lm, Ln) detected in the insufficient site detection step is to be started; a re-measurement step of re-measuring an area starting from the re-measurement start position (Rs) and encompassing the measurement information-insufficient site (Lm, Ln); a three-dimensional measurement information creation step of adapting at least one characteristic site having characteristic information in a re-measurement result acquired by the re-measurement performed in the re-measurement step, and at least one characteristic site having characteristic information in the measurement result acquired in the three-dimensional measurement step, to each other to create three-dimensional measurement information on the measurement range; and a re-measurement start position specification step (s9A) of detecting a highly adaptable characteristic site among the at least one characteristic site based on the measurement result acquired in the three-dimensional measurement step and specifying the highly adaptable characteristic site as the re-measurement start position.