An induction heating device, comprising: a first working coil unit that includes a first and a second working coil (WC1, WC2) connected in parallel to each other; an inverter unit (IV1, IV2) configured to apply a current to at least one of the first and second working coil (WC1, WC2) by performing a switching operation; a first semiconductor switch connected to the first working coil and configured to turn on or off the first working coil; a second semiconductor switch connected to the second working coil and configured to turn on or off the second working coil; and a control unit configured to control respective operations of one or more of the inverter unit (IV1, IV2) and the first and second semiconductor switches (S1, S2) such that a current of a free resonance is generated based on the applied current; detect the current of the free resonance flowing through at least one of the first or second working coil (WC1, WC2); compare a number of pulses of the detected current of the free resonance to a first reference number; compare a frequency of the current of the free resonance to a first reference frequency if the number of pulses of the detected current of the free resonance is equal to or greater than the first reference number; and detect whether at least one of the first or second working coil (WC1, WC2) have a target object located thereon based on the number of pulses or based on the number of pulses and the frequency of the current of the free resonance, wherein the control unit is further configured to: supply N pulses, wherein N is any one of 1, 2 and 3, to the inverter unit every predetermined cycle to detect a location of the target object, and sequentially and repeatedly turn on or off the first and second semiconductor switches (SW1, SW2) according to the N pulses before a location of the target object is detected. a first working coil unit that includes a first and a second working coil (WC1, WC2) connected in parallel to each other; an inverter unit (IV1, IV2) configured to apply a current to at least one of the first and second working coil (WC1, WC2) by performing a switching operation; a first semiconductor switch connected to the first working coil and configured to turn on or off the first working coil; a second semiconductor switch connected to the second working coil and configured to turn on or off the second working coil; and a control unit configured to control respective operations of one or more of the inverter unit (IV1, IV2) and the first and second semiconductor switches (S1, S2) such that a current of a free resonance is generated based on the applied current; detect the current of the free resonance flowing through at least one of the first or second working coil (WC1, WC2); compare a number of pulses of the detected current of the free resonance to a first reference number; compare a frequency of the current of the free resonance to a first reference frequency if the number of pulses of the detected current of the free resonance is equal to or greater than the first reference number; and detect whether at least one of the first or second working coil (WC1, WC2) have a target object located thereon based on the number of pulses or based on the number of pulses and the frequency of the current of the free resonance, control respective operations of one or more of the inverter unit (IV1, IV2) and the first and second semiconductor switches (S1, S2) such that a current of a free resonance is generated based on the applied current; detect the current of the free resonance flowing through at least one of the first or second working coil (WC1, WC2); compare a number of pulses of the detected current of the free resonance to a first reference number; compare a frequency of the current of the free resonance to a first reference frequency if the number of pulses of the detected current of the free resonance is equal to or greater than the first reference number; and detect whether at least one of the first or second working coil (WC1, WC2) have a target object located thereon based on the number of pulses or based on the number of pulses and the frequency of the current of the free resonance, wherein the control unit is further configured to: supply N pulses, wherein N is any one of 1, 2 and 3, to the inverter unit every predetermined cycle to detect a location of the target object, and sequentially and repeatedly turn on or off the first and second semiconductor switches (SW1, SW2) according to the N pulses before a location of the target object is detected. supply N pulses, wherein N is any one of 1, 2 and 3, to the inverter unit every predetermined cycle to detect a location of the target object, and sequentially and repeatedly turn on or off the first and second semiconductor switches (SW1, SW2) according to the N pulses before a location of the target object is detected.