An electric power receiving device comprising: a ferrite (72; 72A; 72B; 72C; 72D; 170) including a first major surface and a second major surface arranged in a thickness direction, the ferrite (72; 72A; 72B; 72C; 72D; 170) being in a form of a plate; and a power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) disposed on the first major surface, wherein the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) surrounds a winding axis (O2; O2A, O2B) that extends in the thickness direction, the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) has a hollow portion (90; 192, 193) when the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) is viewed from an observation position spaced apart from the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) in a direction in which the winding axis (02; O2A, O2B) extends, an outer peripheral portion of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) includes a plurality of bent portions (88; 88A; 88B; 88C; 175, 176, 180, 181), and side portions (89; 89A; 89B; 89C; 177, 178, 182, 183) that connect adjacent ones of the bent portions (88; 88A; 88B; 88C; 175, 176, 180, 181), the ferrite (72; 72A; 72B; 72C; 72D; 170) includes corner portions (91; 91A; 91B; 91C; 91D) that protrude outwardly of the bent portions (88; 88A; 88B; 88C; 175, 176, 180, 181) of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142), when the ferrite (72; 72A; 72B; 72C; 72D; 170) is viewed from the observation position, notch portions (92; 92A; 92B; 92C; 92D; 184, 185) are provided in an outer peripheral portion of the ferrite (72; 72A; 72B; 72C; 72D; 170) such that the notch portions (92; 92A; 92B; 92C; 92D; 184, 185) overlap the side portions (89; 89A; 89B; 89C; 177, 178, 182, 183), respectively, when the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) and the ferrite (72; 72A; 72B; 72C; 72D; 170) are viewed from the observation position, and a width of each of the notch portions (92; 92A; 92B; 92C; 92D; 184, 185) as measured in a circumferential direction of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) increases in a direction away from the hollow portion (90; 192, 193) of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142), characterized in that the side portions (89; 89A; 89B; 89C; 177, 178, 182, 183) extend in the form of straight lines, and a distance between the middle of each side portion (89; 89A; 89B; 89C; 177, 178, 182; 183) and the winding axis (02; O2A, O2B) is shortest, among distances between the outer periphery of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) and the winding axis (02; O2A, O2B). a ferrite (72; 72A; 72B; 72C; 72D; 170) including a first major surface and a second major surface arranged in a thickness direction, the ferrite (72; 72A; 72B; 72C; 72D; 170) being in a form of a plate; and a power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) disposed on the first major surface, wherein the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) surrounds a winding axis (O2; O2A, O2B) that extends in the thickness direction, the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) has a hollow portion (90; 192, 193) when the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) is viewed from an observation position spaced apart from the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) in a direction in which the winding axis (02; O2A, O2B) extends, an outer peripheral portion of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) includes a plurality of bent portions (88; 88A; 88B; 88C; 175, 176, 180, 181), and side portions (89; 89A; 89B; 89C; 177, 178, 182, 183) that connect adjacent ones of the bent portions (88; 88A; 88B; 88C; 175, 176, 180, 181), the ferrite (72; 72A; 72B; 72C; 72D; 170) includes corner portions (91; 91A; 91B; 91C; 91D) that protrude outwardly of the bent portions (88; 88A; 88B; 88C; 175, 176, 180, 181) of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142), when the ferrite (72; 72A; 72B; 72C; 72D; 170) is viewed from the observation position, notch portions (92; 92A; 92B; 92C; 92D; 184, 185) are provided in an outer peripheral portion of the ferrite (72; 72A; 72B; 72C; 72D; 170) such that the notch portions (92; 92A; 92B; 92C; 92D; 184, 185) overlap the side portions (89; 89A; 89B; 89C; 177, 178, 182, 183), respectively, when the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) and the ferrite (72; 72A; 72B; 72C; 72D; 170) are viewed from the observation position, and a width of each of the notch portions (92; 92A; 92B; 92C; 92D; 184, 185) as measured in a circumferential direction of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) increases in a direction away from the hollow portion (90; 192, 193) of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142), characterized in that the side portions (89; 89A; 89B; 89C; 177, 178, 182, 183) extend in the form of straight lines, and a distance between the middle of each side portion (89; 89A; 89B; 89C; 177, 178, 182; 183) and the winding axis (02; O2A, O2B) is shortest, among distances between the outer periphery of the power receiving coil (8; 8A; 8B; 8C; 8D; 141, 142) and the winding axis (02; O2A, O2B).