A power supply device includes: a power transmission coil unit; and a display unit displaying a mark indicating a power supply position of the movable object. A power transmission coil region of the power transmission coil unit has a point-symmetric shape with respect to a center of the power transmission coil region. The display unit includes a first display device displaying a first mark indicating a first power supply position of the movable object in a power supply space when the movable object enters the power supply space in a first direction, and a second display device displaying a second mark indicating a second power supply position of the movable object in the power supply space when the movable object enters the power supply space in a second direction opposite to the first direction.