To provide a liquid fuel supplement device for a fuel cell of mobile phone which can replenish the liquid fuel to the fuel cell of mobile phone by a very simple operation to a user, without making any disturbance to the daily handling of the mobile phone and giving any extra time and effort, and at a low cost.

In the liquid fuel supplement device for the fuel cell of mobile phone, a spare fuel container for containing as a spare the liquid fuel to be filled supplementally into a built-in container for containing the liquid fuel for the fuel cell built in the mobile phone main body, is fitted to the mobile phone main body in series with a mobile phone strap or in parallel with the mobile phone strap.

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