A resonance suppression device (1a-1d; 2; 4a-4c) configured to supply compensation current to a power system from a power conversion device connected to the power system, to suppress resonance which occurs with a power facility being connected to the power system, the resonance suppression device (1a-1d; 2; 4a-4c) comprising: a current command value generation unit (10a-10d; 20; 40a) whereto voltage of the power system is inputted, the current command value generation unit (10a-10d; 20; 40a) being configured to multiply, by a transfer function (110; 110d; 211; 212), a frequency component obtained by eliminating a fundamental wave component from frequency components contained in the inputted voltage, to generate a current command value with respect to the power conversion device so that the compensation current is supplied from the power conversion device to the power system, the current command value generation unit (10a-10d; 20; 40a) including: a first filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in the inputted voltage, to output the resultant; characterized in that the current command value generation unit further includes: a second filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in current supplied from the power facility to the power system, to output the resultant; and in that the resonance suppression device further comprises a coefficient control unit (130a; 130b; 130c; 230; 240) configured to control a coefficient of the transfer function (110; 110d; 211; 212) based on an output value of the second filter. a current command value generation unit (10a-10d; 20; 40a) whereto voltage of the power system is inputted, the current command value generation unit (10a-10d; 20; 40a) being configured to multiply, by a transfer function (110; 110d; 211; 212), a frequency component obtained by eliminating a fundamental wave component from frequency components contained in the inputted voltage, to generate a current command value with respect to the power conversion device so that the compensation current is supplied from the power conversion device to the power system, the current command value generation unit (10a-10d; 20; 40a) including: a first filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in the inputted voltage, to output the resultant; characterized in that the current command value generation unit further includes: a second filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in current supplied from the power facility to the power system, to output the resultant; and in that the resonance suppression device further comprises a coefficient control unit (130a; 130b; 130c; 230; 240) configured to control a coefficient of the transfer function (110; 110d; 211; 212) based on an output value of the second filter. a second filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in current supplied from the power facility to the power system, to output the resultant; and in that the resonance suppression device further comprises a coefficient control unit (130a; 130b; 130c; 230; 240) configured to control a coefficient of the transfer function (110; 110d; 211; 212) based on an output value of the second filter.