Card fixation assembly for card holder and card holder

A card fixation assembly for a card holder, comprising:

• a main body, a first elastic arm, a second elastic arm, a first clamping end, and a second clamping end, wherein a first elastic arm start end and a second elastic arm start end are connected to the main body;
• a first elastic arm tail end is connected to the first clamping end;
• a second elastic arm tail end is connected to the second clamping end;
• the first clamping end comprises a first protrusion;
• the second clamping end comprises a second protrusion;
• the first protrusion and the second protrusion are configured to limit displacement of a card;
• the first protrusion comprises a first concave surface and a first convex surface;
• the first concave surface is matched with an arc of the card;
• the first convex surface is adjacent to the first concave surface, and is located at a tail end of the first protrusion;
• the second protrusion comprises a second concave surface and a second convex surface;
• the second concave surface is matched with the arc of the card;
• and the second convex surface is adjacent to the second concave surface, and is located at a tail end of the second protrusion.