In a card device having a circuit substrate housed in a card casing and an antenna disposed rotatably on the exterior of the card casing, an antenna rotary shaft composed of a conductive material is provided at the base end of the antenna. The antenna rotary shaft extends from the exterior to the interior of the card casing along a substrate surface of the circuit substrate via a through hole of the card casing in such a manner that the antenna rotary shaft is supported rotatably by the card casing while being elevated from the circuit substrate. A section of the circuit substrate that is opposed to the antenna rotary shaft has a feeding terminal fixed thereto. The feeding terminal has a pair of antenna-rotary-shaft elastically-pressing portions that sandwich and electrically contact the antenna rotary shaft from opposite sides with elastic forces in a surface-contact fashion.