A wireless electric power receiver for receiving wireless electric power from a wireless electric transmitter, the wireless electric power receiver comprising: an electric power receiving unit (251, 410, 851) arranged to wirelessly receive the wireless electric power from the wireless electric power transmitter; a rectifying unit (430, 870) arranged to rectify electric power from the wireless electric power receiving unit (251, 410, 851) and to output rectified electric power; and an electric power regulation unit (430, 870) arranged to output first electric power which has a first voltage lower than a voltage of the rectified electric power during a first period and outputting second electric power which has a second voltage substantially identical to the voltage of the rectified electric power for a second period, so as to output electric power with a predetermined voltage value, wherein the electric power regulation unit (430, 870) includes: a node connected to an output end of the rectifying unit (254, 420, 520, 860); a first switch having one end connected to the node; a first capacitor having one end connected to the node; a second switch having one end connected to another end of the first capacitor; a third switch having one end connected to the another end of the first capacitor; and a second capacitor having one end connected to another end of the first switch and another end of the second switch, and another end connected to another end of the third switch, wherein the electric power regulation unit (430, 870) is further arranged to control the first and third switches (532, 534) to be in an on state and the second switch to be in an off state, for the first period, and wherein the electric power regulation unit (430, 870) is further arranged to control the first and third switches (532, 534) to be in an off state and the second switch to be in an on state, for the second period. an electric power receiving unit (251, 410, 851) arranged to wirelessly receive the wireless electric power from the wireless electric power transmitter; a rectifying unit (430, 870) arranged to rectify electric power from the wireless electric power receiving unit (251, 410, 851) and to output rectified electric power; and an electric power regulation unit (430, 870) arranged to output first electric power which has a first voltage lower than a voltage of the rectified electric power during a first period and outputting second electric power which has a second voltage substantially identical to the voltage of the rectified electric power for a second period, so as to output electric power with a predetermined voltage value, wherein the electric power regulation unit (430, 870) includes: a node connected to an output end of the rectifying unit (254, 420, 520, 860); a first switch having one end connected to the node; a first capacitor having one end connected to the node; a second switch having one end connected to another end of the first capacitor; a third switch having one end connected to the another end of the first capacitor; and a second capacitor having one end connected to another end of the first switch and another end of the second switch, and another end connected to another end of the third switch, wherein the electric power regulation unit (430, 870) is further arranged to control the first and third switches (532, 534) to be in an on state and the second switch to be in an off state, for the first period, and wherein the electric power regulation unit (430, 870) is further arranged to control the first and third switches (532, 534) to be in an off state and the second switch to be in an on state, for the second period. a node connected to an output end of the rectifying unit (254, 420, 520, 860); a first switch having one end connected to the node; a first capacitor having one end connected to the node; a second switch having one end connected to another end of the first capacitor; a third switch having one end connected to the another end of the first capacitor; and a second capacitor having one end connected to another end of the first switch and another end of the second switch, and another end connected to another end of the third switch, wherein the electric power regulation unit (430, 870) is further arranged to control the first and third switches (532, 534) to be in an on state and the second switch to be in an off state, for the first period, and wherein the electric power regulation unit (430, 870) is further arranged to control the first and third switches (532, 534) to be in an off state and the second switch to be in an on state, for the second period.