A fire-resistant sheet-like molded article comprising a resin composition and having the relationship between the initial thickness t (mm) and temperature difference _T( C.) between one side and the reverse side after heating of said one side at 500 C. for 1 hour as represented by:

having the initial bulk density at 25 C. of 0.8 to 8.0 g/cm³ and the bulk density after 1 hour of heating at 500 C. of 0.05 to 0.5 g/cm³ is provided along with a method of fabricating a fire-resistant structural steel and fire-resistant wall.