Card holder

A card holder, comprising a card holder body, wherein the card holder body comprises a first card clamping plate, and a second card clamping plate opposite to the first card clamping plate;

• connecting devices are arranged between the first card clamping plate and the second card clamping plate, and the first card clamping plate and the second card clamping plate are connected with each other through the connecting devices;
• the connecting devices are arranged on adjacent sides or opposite sides of the first card clamping plate and the second card clamping plate;
• the connecting devices are opened to occur relative displacement between the first card clamping plate and the second card clamping plate so as to form an internal space being able to stretch out and draw back freely, thus accommodating at least one card;
• each connecting device comprises two connecting pieces being arranged on the first card clamping plate and the second card clamping plate respectively, and the two connecting pieces are directly hinged or indirectly hinged through at least one hinge piece;
• the card holder body further comprises elastic pieces;
• at an initial position, the elastic pieces have an elastic restoring force through which the first card clamping plate and the second card clamping plate are mutually clamped and the connecting pieces are mutually folded;
• and at an open position, the elastic pieces provide the elastic restoring force through which the first card clamping plate and the second card clamping plate are restored to the initial position and the connecting pieces are mutually opened.