To acquire an output value of an analog switch capable of outputting independently of the difference of individual analog quantity detection element without being influenced by the change of an external environment such as temperature or humidity.

By using the analog switch 11 having the analog quantity detection element 13 for detecting an operation quantity such a pressure or a displacement based on a prescribed operation and contacts 12, 14 to be switched between the ON/OFF states when a fixed load is applied thereto by receiving the operation on the position under a press operation member 16, for converting the operation quantity into an output signal of an analog form, the difference required for coincidence of an output value of the analog quantity detection elements 13 at the switching point of time of the contacts 12, 14 to the ON state or the OFF state with an ideal output value of the analog quantity detection elements 13 at the point of time is determined, and the output value of the analog switch 11 is corrected based on the difference. Therefore, the output of the analog switch 11 corresponding to the operation quantity can be acquired even if the output value of the analog quantity detection elements 13 is affected by the external environment.

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