A card connector base is mounted on a printed circuit board and has a metal-inserted housing, a pair of hooking assemblies and a card tray. The metal-inserted housing has a metal substrate and an insulative body. The insulative body is mounted securely on the metal substrate by an insert-molding process. The hook assemblies are mounted on the metal-inserted housing. The card tray is detachably mounted slidably in the metal-inserted housing. Because the metal substrate formed from the sheet-metal is thin and has fine structure strength such as tensile strength and compressive strength, the metal-inserted housing with the metal substrate is more compact and more structurally strong when compare to conventional insulative housings.