A non-contact electric power reception device for receiving in a non-contact manner, electric power transferred from an electric power transmission device, said electric power transmission device including an electric power transmission portion and a power supply portion for supplying AC power to said electric power transmission portion, comprising: an electric power reception portion configured to receive electric power in a non-contact manner from said electric power transmission portion; and an electric load device (190, 120) configured to use electric power received by said electric power reception portion, said electric power reception portion including a resonant coil and an induction coil, the non-contact electric power reception device being characterized in that a distance between said resonant coil and said induction coil of said electric power reception portion being set to achieve higher transmission efficiency at a predetermined power supply frequency of said power supply portion used for non-contact electric power transmission when said electric power reception portion is arranged with predetermined positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion being displaced from each other than in the case when said electric power reception portion and said electric power transmission portion are aligned, and said electric power reception portion being configured such that when said electric power reception portion is arranged with the predetermined positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion being displaced from each other, a peak frequency at which transmission efficiency as a function of electric power transmission frequency exhibits a peak and said predetermined power supply frequency match with each other. an electric power reception portion configured to receive electric power in a non-contact manner from said electric power transmission portion; and an electric load device (190, 120) configured to use electric power received by said electric power reception portion, said electric power reception portion including a resonant coil and an induction coil, the non-contact electric power reception device being characterized in that a distance between said resonant coil and said induction coil of said electric power reception portion being set to achieve higher transmission efficiency at a predetermined power supply frequency of said power supply portion used for non-contact electric power transmission when said electric power reception portion is arranged with predetermined positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion being displaced from each other than in the case when said electric power reception portion and said electric power transmission portion are aligned, and said electric power reception portion being configured such that when said electric power reception portion is arranged with the predetermined positions in a horizontal direction of a central axis of said electric power reception portion and a central axis of said electric power transmission portion being displaced from each other, a peak frequency at which transmission efficiency as a function of electric power transmission frequency exhibits a peak and said predetermined power supply frequency match with each other.