To provide an explosion-proof type fluorescent lamp device capable of pulling out a cap body, a socket and a fluorescent lamp, when the cap body is removed by coupling the cap body of a container for housing the fluorescent lamp with the socket.

Connection terminals 40 are protruded on an outer circumference face of a socket 24, terminal plug-in ports 246 which engage fluorescent lamp terminals are provided at a front face part, a bottom plate 270 of a U-shaped coupler 27 at a cap body 26 is provided turnably at a cap body center, the socket 24 and the cap body 26 are coupled with each other through engagement with engaging means provided at a rear part of the socket part 24, the socket 24 is inserted into a socket holder 21 to be mounted to a lighting fixture, and the cap body 26 is screw-coupled with a socket holder 21. The socket holders 21 are mounted in pairs at both ends of the lighting fixture, and a cylinder shaped protection cover is mounted. The fluorescent lamp is mounted in a protective cover, and is lit.