Abstract: An extension piece for length-reduced memory card includes a base and a case assembled to and covering an outer surface of the base. The case is provided below two lateral sides with two inward open-sided guide channels, front ends of which are adapted to receive two rear corners a length-reduced memory card, and at a top with a retaining structure for releasably engaging with a retaining slot provided at a rear end of the memory card. The extension piece firmly connected to the rear end of the memory card extends the length of the memory card to match the size of an existing card slot on a card reading apparatus, so that the length-reduced memory card could still be conveniently inserted into and moved out of the card slot.