A contactless electric supply apparatus that supplies electric power using electromagnetic induction to an electric reception section provided in a vehicle, the apparatus comprising: a ring-shaped electric supply coil that faces the electric reception section and that supplies electric power to the electric reception section; and a casing that has a bottom surface and a first cover covering the bottom surface and houses the electric supply coil, the first cover having a surface facing the electric reception section, the casing including a second cover being placed between the first cover and the electric supply coil, characterized in that: a second reinforcement member, which is placed in the hollow portion of the electric supply coil, is formed so as to have one end connected to the second cover and the other end connected to the bottom surface, wherein the second cover has a smaller area than the area of the first cover such that: the second cover is configured to overlap at least a portion of the lower side of the surface of the first cover from the direction of the bottom surface, the first cover is formed of a member having high load capacity such as reinforced plastic and the second cover is formed of a fragile material such as heat-resistant glass, a first reinforcement member is formed so as to have one end connected to the first cover and the other end connected to the second cover, wherein the first reinforcement member is configured to attach the second cover to the first cover and to support the first cover, and a space surrounded by the first cover, the second cover, and the first reinforcement member is sealed. a ring-shaped electric supply coil that faces the electric reception section and that supplies electric power to the electric reception section; and a casing that has a bottom surface and a first cover covering the bottom surface and houses the electric supply coil, the first cover having a surface facing the electric reception section, the casing including a second cover being placed between the first cover and the electric supply coil, characterized in that: a second reinforcement member, which is placed in the hollow portion of the electric supply coil, is formed so as to have one end connected to the second cover and the other end connected to the bottom surface, wherein the second cover has a smaller area than the area of the first cover such that: the second cover is configured to overlap at least a portion of the lower side of the surface of the first cover from the direction of the bottom surface, the first cover is formed of a member having high load capacity such as reinforced plastic and the second cover is formed of a fragile material such as heat-resistant glass, a second reinforcement member, which is placed in the hollow portion of the electric supply coil, is formed so as to have one end connected to the second cover and the other end connected to the bottom surface, wherein the second cover has a smaller area than the area of the first cover such that: the second cover is configured to overlap at least a portion of the lower side of the surface of the first cover from the direction of the bottom surface, the first cover is formed of a member having high load capacity such as reinforced plastic and the second cover is formed of a fragile material such as heat-resistant glass, the second cover is configured to overlap at least a portion of the lower side of the surface of the first cover from the direction of the bottom surface, the first cover is formed of a member having high load capacity such as reinforced plastic and the second cover is formed of a fragile material such as heat-resistant glass, a first reinforcement member is formed so as to have one end connected to the first cover and the other end connected to the second cover, wherein the first reinforcement member is configured to attach the second cover to the first cover and to support the first cover, and a space surrounded by the first cover, the second cover, and the first reinforcement member is sealed.