Abstract: A thermosensitive recording material bearing a specific intermediate layer comprising a specific alkyl ammonium salt provides a high color density even with a low printing energy and minimized background strain. The intermediate layer is provided between a support and a thermosensitive recording layer.

Abstract: A heat-sensitive recording material comprising a support, a heat-sensitive coloring layer provided thereon and optionally an undercoat layer provided between these two layers, said heat-sensitive coloring layer and/or said undercoat layer comprising specific, spherical, porous, inorganic particles. The heat-sensitive recording material is excellent in that a sufficient optical density can be obtained when printing is carried out with a low energy, and the fused matters do not substantially adhere to the thermal head when the recording material is printed and the optical density is hardly lowered when printing is carried out with a high energy.