And a capacitance detection module

Module (5) comprises a capacitance detection circuit (10). The capacitance detecting circuit (10) comprises a constant current to the voltage detection point (P) of the constant current source (20), measuring the voltage charging time until the voltage detection point (P) of the time measuring unit reaches a predetermined voltage (28) , a storage unit (30) and an operation unit (32). The second data as the capacitive component (Cp) the charging time of the storage unit (30) a first data storage time obtained in advance as a charging capacitor having a known capacitance value of the element, obtained in advance and stored. Said arithmetic unit (32) from when the capacitor module (Cp) to the voltage detection point (P) when the time measuring unit (28) and said first measured value to generate a difference between the data representing the second detection target (Cs third data) of the charging time, and the detection target (Cs) is calculated based on a ratio between the capacitance value of the third data with the first data and the known capacitance value.