Abstract: A coded-card type lock device includes in combination: an outer housing body for being fixed on a door; a locking unit with a sliding slot and a plurality of partitioning spaces installed in the outer housing body; a plurality of mechanically coded locking pieces movably installed in the partitioning spaces according to a selected code; an operating mechanism movably disposed under the locking unit in the outer housing body for unlocking operation; a resetting member slidingly provided around the periphery of the locking unit for resetting the locking unit to a coded lock position; a lock bolt mechanism movably installed at a front portion of the outer housing body in connection with the operating mechanism; an inner covering member secured over the back side of the outer housing body; and a card-type key having a plurality of segmented sections coded according to the code of the locking pieces for effecting the unlocking operation; and a bolt socket frame matched with the bolt mechanism and fixed on a door f