A touch sensing device is provided. The provided touch sensing device may include a touch sensing circuit having a conducting unit for generating an alternating current (AC) touch signal, a phase delaying circuit electrically coupled to the touch sensing circuit for receiving the AC touch signal and delaying the AC touch signal for a predetermined phase so as to derive a delayed signal, and a determination circuit electrically coupled to the touch sensing circuit and the phase delaying circuit for comparing intensities of the delayed signal and the AC touch signal with a predetermined threshold in order to derive a waveform-overlapping time period. When the waveform-overlapping time period is longer than a predetermined period, the determination circuit concludes the conducting unit is approached or contacted by the conductor.