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There are several researches on 2D gaze tracking techniques for the 2D screen for the human-computer interaction. However, the researches for gaze-based interaction to the 3D stereo images or contents are not reported. The 3D display techniques are emerging now for the reality service. Moreover, the 3D interaction techniques are much more needed in the 3D contents service environments. This paper addresses gaze-based 3D interaction techniques on autostereoscopic display, such as parallax barrier or lenticular display. This paper presents our researches on 3D gaze estimation and gaze-based interaction to autostereoscopic display. The evaluation of our system is shown in terms of accuracy in gaze direction and gaze depth.