Card structure, socket structure, and assembly structure thereof

A card structure, comprising:

• a first substrate comprising a base surface, at least one electronic part region disposed on the base surface, and a terminal region disposed on the base surface;
• a second substrate disposed on the base surface of the first substrate and coupled to the terminal region of the first substrate;
• and
• a connector disposed on the base surface of the first substrate to juxtapose the second substrate, comprising a connecting surface, a contact unit, and a plurality of contact regions disposed on the connecting surface and coupled to the contact unit;
• wherein the connector covers the at least one part region of the first substrate and the plurality of contact regions of the connector are coupled to the terminal region of the first substrate when the connecting surface of the connector is connected to the base surface of the first substrate, such that the plurality of contact regions of the connector are coupled to the second substrate via the terminal region of the first substrate.