To connect together a casing unit and a housing unit which are split apart, during assembly of a cylinder lock device in which a key cylinder and a rotor are operated in conjunction with each other in the directions of their axes and rotation through the operation of a key.

The casing 20 of a cylinder lock device comprises a rear casing 13 and a front casing 14, with a rotor 22 housed in the rear casing 13, and with a key cylinder 21 and a housing case 24 stored in the front casing 14. The rotor 22 and the key cylinder 21 are integrally rotatably connected together by a fitting part 15 of a noncircular cross section and the rotor 22 is rotatably and axially integrally movably connected to the casing 20 by a connection means 16. The rear casing 13 is secured to the front casing 14 by an engagement means 17.