The Mexican Sign Language (LSM) is a language of the deaf Mexican community, which consists of a series of gestural signs articulated by hands and accompanied with facialexpressions. The lack of automated systems to translate signs from LSM makes integration of hearing-impaired people to society more difficult. This work presents a new method for LSM alphanumerical signs recognition based on 3D Haar-like featuresextracted from depth images captured by the Microsoft Kinect sensor. Features are processed with a boosting algorithm. To evaluate performance of our method, we recognized a set of signs from letters and numbers, and compared the results with the useof traditional 2D Haar-like features. Our system is able to recognize static LSM signs with a higher accuracy rate than theone obtained with widely used 2D features.