A control circuit employed for a wireless power receiving apparatus wherein the power receiving apparatus is configured to receive an electric power signal from a wireless power transmission apparatus, the control circuit comprising: an electric power detection unit configured to detect an electric power (P RX) received by the wireless power receiving apparatus; a control unit configured to generate a control signal indicative of a control error, CE, value for controlling an electric power (P TX) to be transmitted from the wireless power transmission apparatus, wherein a positive CE value functions as an instruction to raise the electric power (P TX) to be transmitted; and an abnormal state judgment unit configured to judge, for every first period, whether or not an abnormal state has occurred, based on the received electric power (P RX) detected by the electric power detection unit and a past state of the wireless power receiving apparatus, wherein the abnormal state judgment unit is configured to judge that an abnormal state has occurred when the actual received electric power (P RX) decreases although the control signal instructs to maintain or to increase the transmitted electric power (P TX). wherein the first period is shorter than a second period, and wherein the power transmission apparatus is configured to perform a foreign object detection for every second period, and wherein the abnormal state judgment unit is configured to judge whether or not an abnormal state has occurred based on the CE value and a difference between the electric power P RX_CUR received in a current step and the electric power P RX_PRE received in a previous step, which is represented by ΔP RX = P RX_CUR - P RX_PRE, and (i) when ΔP RX < 0 and the CE value has a positive value or otherwise zero, the judgment is made that an abnormal state has occurred, (ii) when ΔP RX is a positive value, judgement is made that the power transmission is being performed normally, (iii) when ΔP RX is zero and the CE value is a positive value, judgment is made that an abnormal state has occurred, (iv) when ΔP RX is zero and when the CE value is zero or otherwise a negative value, judgment is made that the power transmission is being performed normally. an electric power detection unit configured to detect an electric power (P RX) received by the wireless power receiving apparatus; a control unit configured to generate a control signal indicative of a control error, CE, value for controlling an electric power (P TX) to be transmitted from the wireless power transmission apparatus, wherein a positive CE value functions as an instruction to raise the electric power (P TX) to be transmitted; and an abnormal state judgment unit configured to judge, for every first period, whether or not an abnormal state has occurred, based on the received electric power (P RX) detected by the electric power detection unit and a past state of the wireless power receiving apparatus, wherein the abnormal state judgment unit is configured to judge that an abnormal state has occurred when the actual received electric power (P RX) decreases although the control signal instructs to maintain or to increase the transmitted electric power (P TX). wherein the first period is shorter than a second period, and wherein the power transmission apparatus is configured to perform a foreign object detection for every second period, and wherein the abnormal state judgment unit is configured to judge whether or not an abnormal state has occurred based on the CE value and a difference between the electric power P RX_CUR received in a current step and the electric power P RX_PRE received in a previous step, which is represented by ΔP RX = P RX_CUR - P RX_PRE, and (i) when ΔP RX < 0 and the CE value has a positive value or otherwise zero, the judgment is made that an abnormal state has occurred, (ii) when ΔP RX is a positive value, judgement is made that the power transmission is being performed normally, (iii) when ΔP RX is zero and the CE value is a positive value, judgment is made that an abnormal state has occurred, (iv) when ΔP RX is zero and when the CE value is zero or otherwise a negative value, judgment is made that the power transmission is being performed normally. (i) when ΔP RX < 0 and the CE value has a positive value or otherwise zero, the judgment is made that an abnormal state has occurred, (ii) when ΔP RX is a positive value, judgement is made that the power transmission is being performed normally, (iii) when ΔP RX is zero and the CE value is a positive value, judgment is made that an abnormal state has occurred, (iv) when ΔP RX is zero and when the CE value is zero or otherwise a negative value, judgment is made that the power transmission is being performed normally.