Memory card adapter

A memory card adaptor may include a plurality of card-side terminals arranged to contact terminals of a memory card, a plurality of socket-side terminals arranged in a first direction to contact terminals of a host socket and including at least two socket-side ground terminals, wiring lines configured to electrically connect the plurality of card-side terminals to the plurality of socket-side terminals in a one-to-one correspondence, a ground frame configured to electrically connect the at least two socket-side ground terminals to each other, and a housing that accommodates the plurality of card-side terminals, the plurality of socket-side terminals, and the wiring lines. The memory card adaptor may have good electrical characteristics, and thus may be able to stably operate even during fast data transmission.