When the remaining toner amount within a developer is relatively large, a control target value of a toner amount is set to Ttgt1, and a lower limit value of a toner amount which can regarded proper is set to TL1. Players are identified before the start of the game. A flange is connected to the core. 2 wt % or less or none of V2O5 and is optimized to be used in the temperature range up to maximum 450 to 600 C. A sliding channel of the sliding holder is provided with locating cuts for the sliding block to be relatively secured in position. When the current supplied to the load by the fuel cell overshoots the maximum rated current value, the fuel cell current is immediately reduced by increasing the fuel cell voltage.