The high-frequency control unit according to the present invention is provided with an integrated-value calculation part for calculating, over time, a measured integrated value which is the measured value of an integrated value from the output start time of an outputted high-frequency electric power. The high-frequency control unit is provided with a target trajectory setting part for setting a target trajectory indicating, over time, a target integrated value which is a target value of the integrated value from the output start time of the outputted high-frequency electric power, and a control part for comparing, over time, the measured integrated value with the target trajectory and controlling, over time, the output state of the high-frequency electric power on the basis of the comparison result.