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In this paper, we propose a biometrics authentication method using lip motion in utterance. The proposed authentication method authenticates persons using lip shape (physical trait) and lip motion accompanying utterance (behavioral trait). Hence, the proposed method can be realized with only a camera extracting lip area without the special equipment used in other personal authentication methods and can easily change the registration data. Conventional methods using a lip image use time differential coefficients of horizontal and vertical lip ranges, and their corresponding rates. However, these features cannot describe the lip motion in detail because the extraction of the exact lip shape is difficult. Therefore, the proposed authentication method uses features concerned with lip shape, which are extracted from a divided lip region, and extracts lip motion by dynamic time warping (DTW). Experimental results demonstrate that the proposed method can achieve an authentication rate of more than 99.5 %.