To provide a cylinder lock which can prevent a breakage of tumblers inside a cylinder body even if an improper key is inserted for a rotary operation.

The cylinder lock comprises a lock body containing a cylinder body 110 and a lock mechanism 130 in a casing. The cylinder body 110 is a cylindrical body which locks or unlocks the lock mechanism 130 by rotating and sliding and contains first tumbler holding bodies 112, 113, and 114 and second tumbler holding bodies 115, 116, and 117. The first tumbler holding bodies 112, 113, and 114 and the second tumbler holding bodies 115, 116, and 117 hold a first keyhole tumbler and a second keyhole tumbler respectively paired with a tumbler on an outer peripheral surface protruding from the outer peripheral surface of the cylinder body 110. The first keyhole tumbler and the second keyhole tumbler contain a first keyhole projection and a second keyhole projection 123a protruding from a keyhole 111.