Abstract: The packaging box includes an inner box body 20 and an outer box body 10 each made of paper. In the inner box body 20, a protection box portion 21 for protecting the screw portions 3d and the outer side electrodes 3e of the spark plugs 3 is formed by being bent. Screw portion insertion holes 30 capable of passing the screw portions 3d of the spark plugs 3 therethrough and bent tabs 32 being bent at the inside of the protection box portion 21 are provided on the upper surface of the protection box portion 21. The lower surfaces of the large diameter portions 3c of the metallic shells of the spark plugs are supported by the upper surface of the protection box portion 21 including the bent edges 31b of the bent tabs 32.

Abstract: The packaging box includes an inner box body 20 and an outer box body 10 each made of paper. In the inner box body 20, a protection box portion 21 for protecting the screw portions 3d and the outer side electrodes 3e of the spark plugs 3 is formed by being bent. Screw portion insertion holes 30 capable of passing the screw portions 3d of the spark plugs 3 therethrough and bent tabs 32 being bent at the inside of the protection box portion 21 are provided on the upper surface of the protection box portion 21. The lower surfaces of the large diameter portions 3c of the metallic shells of the spark plugs are supported by the upper surface of the protection box portion 21 including the bent edges 31b of the bent tabs 32.

Abstract: A wave absorber comprising a foamed resin and a dielectric loss material dispersed therein, wherein the foamed resin is a foamed melamine resin obtained by foaming a resin composition comprising, as the main components, a melamine-formaldehyde condensate and a foaming agent. The wave absorber alleviates the problems of the prior art, and is lightweight and superior in self-extinguishing property, and shows an excellent wave-absorbing property owing to a uniformly dispersed dielectric loss material.