Key lock device

A key lock device comprising:

• a first signal transmitting/receiving means provided on a key having a key shank and a grip portion, and
• a second signal transmitting/receiving means provided on a key cylinder, in which
• radiowave signals are transmitted and received between said first and second signal transmitting/receiving means to each other upon insertion of the key into the key cylinder, to thereby determine whether the inserted key is authentic, wherein
• the second signal transmitting/receiving means provided on the key cylinder comprises a cover member, a connector, a coil bobbin and a coiled antenna,
• said cover member being disposed at a front end of the key cylinder, coaxially with an axial line for the insertion of the key and integrally molded with the connector,
• said coil bobbin having said coiled antenna wound around a circumferential surface thereof coaxially with said axial line, and base ends of connecting pins of the connector being secured to the coil bobbin, and
• said coil bobbin, said coiled antenna and said connector pins being insert molded together in said cover member, and wherein
• the grip portion of the key has a holding member formed integrally at the inside thereof, the first signal transmitting/receiving means provided on the key is housed to the inside of the holding member, the holding member has a holding aperture formed at the inside thereof, and axial ridges extend in the axial direction of said holding aperture and are disposed on the inner circumferential surface of said holding aperture, said axial ridges being spaced apart circumferentially from each other and protruded radially so as to give resilient support to the first signal transmitting/receiving means provided on the key.