To provide a required bulletproof effect by stretching an armor glass without physical breakage (boring) in structure of a fixed wing aircraft, rotary wing aircraft, ship, fighting vehicle, general vehicle or building body.

A Velcro tape is stuck to an object outside rails fixed to a floor face, a wall surface and a door. A protective mat having a height larger than the height of the rail and having Velcro tapes stuck to the surface and back sides thereof is fitted to the Velcro tape, and the armor glass having a Velcro tape on the lower surface to be fitted is installed. The armor glass is fitted to the wall surface or door having no projecting and recessed parts directly through the Velcro tape.