High-speed interface connector

A memory card socket that supports a memory card for a differential transmission system including:

• a card pin arrangement, in which a first and a second pins adjacent to each other are differential transmission signaling pins, out of a third and a fourth pins that are disposed on both sides of the pair of the first and the second pins, the third pin is adjacent to the first pin and on the side opposite of the second pin with respect to the first pin, the fourth pin is adjacent to the second pin and on the side opposite of the first pin with respect to the second pin, the third and the fourth pins have potentials different from each other;
• and a fifth pin connected to a stable potential identical to that of the fourth pin, the memory card socket comprising:
• a first and a second differential transmission contact terminals that are adjacent to each other and respectively connected to the first and the second differential transmission signaling pins of the memory card;
• and
• a third and a fourth contact terminals provided on both sides of the pair of the first and the second contact terminals, the third contact terminal being adjacent to the first contact terminal and positioning on the side opposite of the second contact terminal with respect to the first contact terminal, the fourth contact terminal being adjacent to the second contact terminal and positioning on the side opposite of the first contact terminal with respect to the second contact terminal, wherein
• the fourth contact terminal is connected to the fourth pin of the memory card, and the third contact terminal is connected to the fifth pin connected to the stable potential identical to that of the fourth pin instead of the third pin of the memory card.