The contents of caffeine in caffeine containing products in Korea, i.e., coffee. tea, cocoa and cola, and the individual pattern of consumption of caffeine containing beverages were studied to know the pattern of caffeine consumption. The correlation in between the amount of caffeine consumption and the obesity were also investigated. In results, the average contents of caffeine in the instant coffee was $31.8pm4.4mg/g(mean{pm}SD)$. The amount of caffeine in coffee were $68.2pm13.0;mg/cup$ in the vending machine coffee, and $76.6pm12.1;mg/cup$ in the coffee shop coffee. Average daily caffeine consumption per person was investigated to be 128mg with the wide range of 26mg-341mg. There was no correlation in the amount of daily caffeine consumption and the obesity.