A water handling equipment comprising a touch detection device, the touch detection device comprising: a sensing portion configured to sense contact with a target object; a vibration excitation element attached to the sensing portion; a drive circuit configured to excite a vibration in the sensing portion by intermittently applying an AC voltage at a predetermined frequency to the vibration excitation element; an envelope detector having as an input an output signal from the vibration excitation element and having an envelope detection output configured to output an envelope detection signal; and a contact determination circuit configured to determine whether the target object has contacted the sensing portion based on vibration of the sensing portion after application of the AC voltage to the vibration excitation element by the drive circuit; wherein the vibration excitation element comprises a piezo-electric element and the contact determination circuit is configured to determine whether the target object has contacted the sensing portion based on the output signal from the vibration excitation element detected after stopping of the application of the AC voltage to the vibration excitation element; wherein the contact determination circuit is configured to form a sum value of results that are obtained by sampling and A/D converting the envelope detection signal at fixed intervals, after stopping the application of the AC voltage to the vibration excitation element, wherein said sum value forms a detected vibration energy, the contact determination circuit is configured to determine whether or not the target object has contacted the sensing portion based on the detected vibration energy of the sensing portion detected after the stopping of the application of the AC voltage by the drive circuit, and the contact determination circuit is configured to determine that the target object has made contact when the detected vibration energy is at or below a predetermined threshold value, wherein the contact determination circuit comprises an anomaly sensing circuit for preventing false sensing, and the anomaly sensing circuit is configured to sense an anomaly based on the output signal from the vibration excitation element detected during application of the AC voltage to the vibration excitation element, wherein during application of the AC voltage to the vibration excitation element, the anomaly sensing circuit is configured to sense anomaly when the amplitude of the output signal exceeds a predetermined level, and the contact determination circuit is configured not to determine the contact of the target object when the anomaly has been sensed. a sensing portion configured to sense contact with a target object; a vibration excitation element attached to the sensing portion; a drive circuit configured to excite a vibration in the sensing portion by intermittently applying an AC voltage at a predetermined frequency to the vibration excitation element; an envelope detector having as an input an output signal from the vibration excitation element and having an envelope detection output configured to output an envelope detection signal; and a contact determination circuit configured to determine whether the target object has contacted the sensing portion based on vibration of the sensing portion after application of the AC voltage to the vibration excitation element by the drive circuit; wherein the vibration excitation element comprises a piezo-electric element and the contact determination circuit is configured to determine whether the target object has contacted the sensing portion based on the output signal from the vibration excitation element detected after stopping of the application of the AC voltage to the vibration excitation element; wherein the contact determination circuit is configured to form a sum value of results that are obtained by sampling and A/D converting the envelope detection signal at fixed intervals, after stopping the application of the AC voltage to the vibration excitation element, wherein said sum value forms a detected vibration energy, the contact determination circuit is configured to determine whether or not the target object has contacted the sensing portion based on the detected vibration energy of the sensing portion detected after the stopping of the application of the AC voltage by the drive circuit, and the contact determination circuit is configured to determine that the target object has made contact when the detected vibration energy is at or below a predetermined threshold value, wherein the contact determination circuit comprises an anomaly sensing circuit for preventing false sensing, and the anomaly sensing circuit is configured to sense an anomaly based on the output signal from the vibration excitation element detected during application of the AC voltage to the vibration excitation element, wherein during application of the AC voltage to the vibration excitation element, the anomaly sensing circuit is configured to sense anomaly when the amplitude of the output signal exceeds a predetermined level, and the contact determination circuit is configured not to determine the contact of the target object when the anomaly has been sensed.