to fig7 the present invention provides a card connector 1 which is used for a connection with two cards having mutually different transmission speeds such as an express card and a smart card the card connector 1 comprises a first connector 10 defining a first receiving space 14 for receiving a first card a a second connector 20 stacked with the first connector 10 and defining a second receiving space 220 for receiving a second card b and an opening not labeled for a card inserting ejecting as shown in fig1 and fig2 the first connector 10 comprises a first metal shell 11 an insulating housing 30 covered by the first shell 11 a plurality of first terminals 4 protruding into the first receiving space 14 to engage with the first card a a first ejecting mechanism 6 and a second ejecting mechanism 5 for ejecting the first card a and the second card b respectively the first shell 11 approximate a rectangular shape in a top plan view and an u shape in a front view comprises a first top wall 12 and a pair of first lateral walls 13 extending downwardly from the opposite sides of the first top wall 12 the first receiving space 14 is defined by the.