An induction heating device comprising: a first board having, thereon: a first working coil connected to a first resonant capacitor; a first inverter for performing a switching operation to apply a resonant current to the first working coil; a first control unit configured for controlling an operation of the first inverter; and a second board having, thereon: a second working coil connected to a second resonant capacitor; a second inverter for performing a switching operation to apply a resonant current to the second working coil; a second control unit configured for controlling an operation of the second inverter; characterized in that the induction heating device further comprises: a first current transformer on the first board for adjusting a magnitude of the resonant current output from the first inverter and for transmitting the resonant current having the adjusted magnitude to the first working coil; a second current transformer on the second board for adjusting a magnitude of the resonant current output from the second inverter and for transmitting the resonant current having the adjusted magnitude to the second working coil; a first relay for selectively connecting one end of the second working coil to the second current transformer or one end of the first working coil; a second relay for selectively connecting the other end of the second working coil to the other end of the first working coil or to the second resonant capacitor; and wherein the second control unit is configured for controlling respective operations of the first and second relays (R1, R2). a first board having, thereon: a first working coil connected to a first resonant capacitor; a first inverter for performing a switching operation to apply a resonant current to the first working coil; a first control unit configured for controlling an operation of the first inverter; and a first working coil connected to a first resonant capacitor; a first inverter for performing a switching operation to apply a resonant current to the first working coil; a first control unit configured for controlling an operation of the first inverter; and a second board having, thereon: a second working coil connected to a second resonant capacitor; a second inverter for performing a switching operation to apply a resonant current to the second working coil; a second control unit configured for controlling an operation of the second inverter; characterized in that the induction heating device further comprises: a first current transformer on the first board for adjusting a magnitude of the resonant current output from the first inverter and for transmitting the resonant current having the adjusted magnitude to the first working coil; a second current transformer on the second board for adjusting a magnitude of the resonant current output from the second inverter and for transmitting the resonant current having the adjusted magnitude to the second working coil; a first relay for selectively connecting one end of the second working coil to the second current transformer or one end of the first working coil; a second relay for selectively connecting the other end of the second working coil to the other end of the first working coil or to the second resonant capacitor; and wherein the second control unit is configured for controlling respective operations of the first and second relays (R1, R2). a second working coil connected to a second resonant capacitor; a second inverter for performing a switching operation to apply a resonant current to the second working coil; a second control unit configured for controlling an operation of the second inverter; characterized in that the induction heating device further comprises: a first current transformer on the first board for adjusting a magnitude of the resonant current output from the first inverter and for transmitting the resonant current having the adjusted magnitude to the first working coil; a second current transformer on the second board for adjusting a magnitude of the resonant current output from the second inverter and for transmitting the resonant current having the adjusted magnitude to the second working coil; a first relay for selectively connecting one end of the second working coil to the second current transformer or one end of the first working coil; a second relay for selectively connecting the other end of the second working coil to the other end of the first working coil or to the second resonant capacitor; and wherein the second control unit is configured for controlling respective operations of the first and second relays (R1, R2). a first current transformer on the first board for adjusting a magnitude of the resonant current output from the first inverter and for transmitting the resonant current having the adjusted magnitude to the first working coil; a second current transformer on the second board for adjusting a magnitude of the resonant current output from the second inverter and for transmitting the resonant current having the adjusted magnitude to the second working coil; a first relay for selectively connecting one end of the second working coil to the second current transformer or one end of the first working coil; a second relay for selectively connecting the other end of the second working coil to the other end of the first working coil or to the second resonant capacitor; and wherein the second control unit is configured for controlling respective operations of the first and second relays (R1, R2).