A card connector includes contacts adapted to contact contacts of two memory cards, a housing having inserting openings for inserting the memory cards and arranging and holding the contacts therein, and a shell covering the housing. The housing includes two side walls, a rear wall, and a lower wall contiguous with these side and rear walls to form the inserting openings for the memory cards by these two side walls, rear wall and lower wall, and is provided with a pivotally movable plate to form, by its pivotal movement, the one inserting opening for inserting either of the cards and simultaneously to prevent the other card from being inserted. The card connector enables stable connection by merely inserting two different cards having equal lengths in the inserting direction and different widths and thicknesses into the connector.