Abstract: The relation between speech and hand movement has been unclear. The findings of behavioral and neurological researches on the relation between speech and two types of hand movement, specifically gestures accompanied with speech and grasping, were reviewed. The results were summarized as follows: (1) gestures accompanied with speech facilitated speech process, especially lexical retrieval; (2) online observation of hand grasping influenced the lip movement and voice of speech; (3) word perception influenced the plan of grasping; (4) speech production increased the excitability of hand motor cortex. It was implied that the relation between speech and hand movement was reflected not only in the overlap and mutual activation of neural paths, but also in interaction of explicit behavior. The further researches focusing the relation between hand movement and sub-processes of speech perception and production were suggested

Key words: speech, gesture, grasping, mirror neuron