A pulse pre-amplifier for use in the measurements of fast photoconduction decays less than 1 us has been constructed by using ultrafast operational amplifiers. A flat frequency response with little phase distortion is obtained over the range from DC to 10 MHz and the rise time is about 30 ns. The amplifier should be operated with batteries in order to reduce the disturbance from strong noises of a light pulse generator used for the sample illumination.