To provide a cylinder lock set in which an auxiliary lock coinciding with the unlocking code of a lock can be acquired easily.

The cylinder lock set has a sub-cylinder lock 3, in which code variable tumblers 1 capable of changing unlocking codes from at least one to the other and code fixed tumblers 2 in which unlocking codes are determined in one kind are mixed and to which unlocking code numbers capable of discriminating the unlocking codes by the code fixed tumblers 2 are imparted, and a main cylinder lock 4, in which the code fixed tumblers 2 are arranged at the same places as the places of the tumbler arrangement of the sub-cylinder lock 3 and one unlocking codes of pairs of variable unlocking codes by the code variable tumblers 1 are arranged at the places of the arrangement of the code variable tumblers 1 for the sub-cylinder lock 3 and fixed unlocking codes by the code fixed tumblers 2 for the sub-cylinder lock 3 at residual places and to which the unlocking code numbers are imparted in a discriminating manner in the fixed unlocking codes. The unlocking codes are conformed to the main cylinder lock 4 by code-changing the code variable tumblers 1 for the sub-cylinder, to which fixed unlocking codes coinciding with the fixed unlocking codes imparted to the main cylinder lock 4 are imparted, and both cylinder locks can be operated by the same unlocking key 7.