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 . <EOS>