The purpose of this study was to clarify the difference in mandibular movements during chewing of soft and hard foods. The mandibular movement was recorded using a Mandibular Kinesiograph (MKG-K6I) when the healthy dentate adults chewed chewing gum (soft food) on the habitual chewing side for 20 seconds. They showed that the amount of glucose eluted when chewing gummy jelly exceeded the reference value. For the 10 cycles from the 5th cycle, the masticatory movement path patterns were classified into 5 types by displaying the superimposed path and average path. The mandibular movement of the subjects showing a normal pattern chewed a peanut (hard food) on the habitual chewing side until swallowing was recording using a MKG. The pattern of masticatory movement path during chewing of peanut was classified. Next, the amount of movement and movement rhythm during chewing of soft and hard foods were calculated and compared between the foods. The pattern of masticatory movement path did not change with the difference of foods in all subjects. The amount of movement was significantly greater when chewing a peanut than when chewing a softened gum, and a significant difference was observed between the two foods. The movement rhythm tended to be longer when chewing a peanut than when chewing a softened gum, but there was no significant difference between the two. From these results, in healthy dentate adults who have a normal masticatory movement path pattern and good masticatory performance when chewing soft food, it was suggested that no change in the masticatory movement path pattern was observed even when chewing hard food, and that the amount of movement increased significantly when chewing hard food.