A sample ingredient analyzing system, and a sensor pack and a sensor chip usable in the system. The analyzing system has an analyzing device of a simple structure to which the sensor chip can be easily attached. The sensor pack containing the sensor chip is inserted into an opening of the analyzing device. When a slider is pushed in by the sensor pack, a supporting member rotates and a retaining member penetrates a film and plunges through a hole in the sensor chip. When the packaging material of the sensor pack is drawn out, only the sensor chip is retained by the retaining member. When a button is pressed, the supporting member rotates to release the retaining member from the retaining state, thereby enabling the sensor chip to be thrown away.
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