Protecting a card key for vehicles from breakage

A breakage prevention type card key comprising:

• a substrate part installed inside a case part;
• a key accommodation part connected to the substrate part and having a groove into which an auxiliary key part is inserted, the key accommodation part being separate and distinct from the case part, the substrate part including a groove into which the key accommodation part is inserted;
• a locking part located inside the key accommodation part and elastically pressurizing a side surface of the auxiliary key part stored in the key accommodation part to restrain movement of the auxiliary key part;
• and
• a reinforcement part extended from the key accommodation part and coupled to the case part and augmenting rigidity of the case part located on both sides of an entrance of the key accommodation part, wherein
• the key accommodation part comprises:
• a cover part connected to the reinforcement part and having a space for accommodating the auxiliary key part,
• a base part is connected to the cover part and forms a plate member in a shape corresponding to the auxiliary key part, and
• the case part is made of resin in the shape surrounding the substrate part and the key accommodation part.