An electric supply apparatus that is adapted to contactlessly supply 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 is adapted to supply electric power to the electric reception section; and a casing that houses the electric supply coil, characterized in that the casing includes a first incline portion, a second incline portion, and a recessed portion on an upper surface of the casing, the upper surface being a surface facing the electric reception section: the first incline portion being formed in a portion of the upper surface where the electric supply coil is projected when the electric supply coil is projected on the casing toward the electric reception section, and gradually approaching the electric supply coil from a top portion on the upper surface toward an inner edge portion of the electric supply coil in a radial direction of the electric supply coil; the second incline portion being formed in the portion of the upper surface where the electric supply coil is projected, and gradually approaching the electric supply coil from the top portion toward an outer circumference of the electric supply coil in the radial direction of the electric supply coil; and the recessed portion being in contact with an end portion of the first incline portion located in a direction different from the top portion. a ring-shaped electric supply coil that faces the electric reception section and that is adapted to supply electric power to the electric reception section; and a casing that houses the electric supply coil, characterized in that the casing includes a first incline portion, a second incline portion, and a recessed portion on an upper surface of the casing, the upper surface being a surface facing the electric reception section: the first incline portion being formed in a portion of the upper surface where the electric supply coil is projected when the electric supply coil is projected on the casing toward the electric reception section, and gradually approaching the electric supply coil from a top portion on the upper surface toward an inner edge portion of the electric supply coil in a radial direction of the electric supply coil; the second incline portion being formed in the portion of the upper surface where the electric supply coil is projected, and gradually approaching the electric supply coil from the top portion toward an outer circumference of the electric supply coil in the radial direction of the electric supply coil; and the recessed portion being in contact with an end portion of the first incline portion located in a direction different from the top portion. the first incline portion being formed in a portion of the upper surface where the electric supply coil is projected when the electric supply coil is projected on the casing toward the electric reception section, and gradually approaching the electric supply coil from a top portion on the upper surface toward an inner edge portion of the electric supply coil in a radial direction of the electric supply coil; the second incline portion being formed in the portion of the upper surface where the electric supply coil is projected, and gradually approaching the electric supply coil from the top portion toward an outer circumference of the electric supply coil in the radial direction of the electric supply coil; and the recessed portion being in contact with an end portion of the first incline portion located in a direction different from the top portion.