An extruded propylene resin foam which is obtained by extrusion-foaming a propylene resin and has an expansion ratio of 10 or higher and an average cell diameter smaller than 400 µm. The foam contains a fibrous filler in an amount of 60 wt.% or smaller based on the whole molding material. Due to this constitution, the extruded foam can have many cell walls therein. The extruded propylene resin foam can hence efficiently block external radiant heat and has excellent heat-insulating performance. The fibrous filler is arranged along the thickness direction. Because of this, even when the extruded foam is distorted in the thickness direction slightly, this generates a high stress. The extruded foam can hence have improved energy-absorbing ability.