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The purpose of this study was to investigate the effect of the bending degree of the trunk when using smartphones on the lung capacity. Thirty young people were recruited for this study, and they were randomly assigned to either Group A (a posture with the back straight), Group B (a posture with both arms on a desk and the trunk bending 70°), or Group C (a posture using a smartphone with the forearms on the thighs), each 10. Subjects of each group were maintained the postures for 30 minutes. Vital capacity was measured before and after the intervention. Subjects of all groups showed significant decreases in vital capacity (p<.05), and subjects of Group C revealed a more significant decrease in vital capacity compared to the other two groups (p<.05). These findings indicate that there was more significant reduction in the vital capacity in greater the bending degree of the trunk. The use of smartphone may be important factor to influence on vital capacity; therefore, it is necessary to maintain a good posture while using smartphones for a long time.