Abstract: A cylinder lock is disclosed having significant resistance to damage or tampering. The cylinder lock comprises a cam provided on the key cylinder; and a pair of pins disposed radially slidably in openings provided in the sleeve rotatably disposed within a casing. The pins are moved within the openings of the sleeve by the cam on the key cylinder which is rotatably positioned within the sleeve when the key cylinder is turned by a proper key independently of the sleeve to a predetermined angle, as tumblers provided within the key cylinder are disengaged from the sleeve. Then, the pin comes into engagement with and is rotated with the connector together to unlock the lock device.