This invention relates to a door lock comprising a lock body (3) fitted with a front plate and a bolt (4). The transfer of external force to the locking piece (5) in the lock body is reduced. The reduction of external force is arranged in two stages of transmission. At the first stage of transmission, the transmitted force is reduced using a wedge part (10) that is in force transmission contact with a lever (11). The second stage of transmission constitutes the lever.