To fix a lock to a lock fitting plate, the lock so that a stroke portion is not protruded from a body of a cabinet or the like, and lock and unlock the lock by sliding an operating means longitudinally by the rotation of a key.

This cylinder lock has an inner cylinder 5 of a rotary body for being rotated by a key, with which a pin 15 is protrusively fixed and an operating means 2 having a spiral groove 10 engaged with the pin 15 is provided so as to be slid by the rotation of the key. An operating piece 9 provided at the tip of the operating means 2 is longitudinally moved to rotate a key bar 3 for locking. The operating means 2 can therefore be slid horizontally as a lock provided at furniture such as a cabinet, so that a stroke portion is not protruded not only at the time of locking but also at the time of unlocking. There is therefore no risk of contact of a person or a thing, nor is the locked being pushed.