The present invention and in the protective case to prevent damage to the portable terminal, the substrate 18 to leave the piezoelectric element layer 20, a piezoelectric vibrating body (17) attached to the at least one side of the substrate 18, the piezoelectric element at least one weight piece actuator 12 is configured as a bracket 24 for the attachment fixed at both ends of 22, the substrate 18 and to increase the vibration force attachment is fixed to the floor (20), the actuator ( receive the signal transmitted from the Bluetooth transmitter module 28 of the portable terminal (4); 12) the auxiliary battery 10 and the power source with the input tray to the used for charging the battery discharges and consumption of the mobile terminal 4 the mobile terminal configured as a Bluetooth receiver module 30, by providing the actuator 12 that provides real-time vibration feedback on the inside of the protective case (2), (2a) wearing to prevent damage of the portable terminal 4 for ( use a haptic signal for the video and audio output from the 4) And the character effect that may simultaneously sense by providing a rapid oscillation in response to, and a large vibration by controlling adjusting the vibration amount or the vibration motor 14 at the low frequency of the actuator 12 in accordance with the vibration amplitude is to provide a vibration feedback and micro-vibration can deliver a variety of vibration patterns has an effect that could realistically.