Disclosed is an articulator to check the alignment of teeth by attaching upper and lower jaw models. Upper and lower jaw parts have simple movement structures, the occlusal error of upper and lower jaw models is minimized, and the upper and lower jaw models are accurately mounted on an occlusal plane. A conventional articulator is manufactured by emulating the shape of upper and lower jaw movement and has a folding structure in which the position of the reference axis of the articulator corresponds to the condyle. The articulator has a structure except for the movement of a specific muscle, so that errors occur in upper and lower jaw movement. Even if the errors are reduced by using various auxiliaryunits, the post-process is essentially required. Occlusion is not accurately performed in the conventional articulator, but the structure of the articulator is excessively complicated and a worker has difficulty with the work. In a non-arcon type articulator, a reference axis is formed on a line extending from a central plane of the upper and lower jaw fixing members, such that the tangential line of the rotation movement is perpendicular to the occlusal plane. The non-arcon type articulator moves up or down more similarly to physiological movement when comparing with the conventional articulator to finely adjust the occlusal state by using an auxiliary unit, so that the error margin of the articulator is minimized, and the operating structure and the use of the upper and lower jaw fixing members are simplified.