The present invention relates to a temperature sensing device for measuring a body temperature. According to the present invention, the temperature sensing device for measuring a body temperature comprises: a piezoelectric element for converting mechanical vibration energy generated by movement of a body of a user into electric energy of an alternating current electric type； a rectification unit for converting electric energy of an alternating current electric type into electric energy of a direct current electric type； a power storage unit for storing the electric energy of a direct current electric type applied from the rectification unit； a temperature sensor for receiving the electric energy from the power storage unit to be operated, detecting a body temperature of the user, and outputting body temperature data； a wireless communications unit for receiving the electric energy from the power storage unit to be operated, and transmitting the applied body temperature data to a mobile terminal through low power wireless communications； and a control unit for receiving power from the power storage unit to be operated, controlling the temperature sensor and the wireless communications unit, and applying the body temperature data detected by the temperature sensor to the wireless communications unit to transmit the same. The temperature sensing device of the present invention is attached to a human body to measure a body temperature, acquires electric energy from movement of a human being to be operated by the electric energy, and measures a body temperature to transmit body temperature data through low power wireless communications, thereby acquiring and transmitting body temperature data economically without separate battery management for power supply. Moreover, the temperature sensing device is operated at a predetermined cycle when body temperature data is acquired and transmitted to reduce a used amount of electric energy acquired from movement of a human being,
