A card connector (100) includes a first housing (1), a second housing (2) stacked with the first housing, and a pair of standoffs (7). The first housing includes a first shell (10) having a first main body (11) comprising a pair of clasps (15). The second housing includes a second shell (20) having a second main body (22) and a pair of side walls (21) extending from the second main body, and each side wall has a plurality of elastic pieces (210, 211, 212). The standoffs mounted on opposite lateral sides of the first shell and the second shell. Each standoff comprising a fixing plate (71) and a locking piece (72) extending towards to the first shell from the fixing plate. The fixing plate has a plurality of through holes (74, 75) to assemble with corresponding elastic pieces of the second shell, and each locking piece provides with a locking hole (720) to fasten with corresponding clasps of the first shell.