Warning alarm apparatus and method for steering wheel

Danger alarm system of the steering wheel for a vehicle according to the present invention includes a sensor unit, the sensor unit for detecting the risk through a sensor mounted on a piezoelectric transducer, a current supply portion, the steering wheel or a vehicle which is installed at least one of the handles of the steering wheel If the sensor values ​​detected in the included in the control section critical alarm range which the sensor value comprising a control unit for controlling operation of the current supply section in accordance with the sensor value determined whether or not, and that within the scope critical alarm, by the movable parts of the electric current supplied to the piezoelectric transducer, and supplies the drive current to the piezoelectric transducer vibrates the steering wheel and converts the received driving current supplied from the current supply to the vibration.