To provide a heat insulation sheet on which a sterilizing and deodorizing action is performed surely and uniformly on the whole surface.SOLUTION: The heat insulation sheet of the present invention comprises: a sheet-like substrate 1 comprising a fibrous material such as woven fabric, nonwoven fabric, felt, Japanese paper, or the like； a heat insulating layer 2 coated or impregnated on at least one surface of the substrate 1, comprising a heat insulating coating containing glassy hollow beads 2a having a fine particle size and titanium dioxide which reflects light； and a sheet-like cover body 4 comprising a fibrous material having light transmissivity and air permeability, which is adhered to a surface of the heat insulating layer 2 with a sheet-like hot melt adhesive 3. The surfaces of the cover body 4 and the heat insulating layer 2 are each formed in a flat surface and are adhered to each other. A thickness between the surface of the cover body 4 and the surface of the heat insulating layer 2 is constituted to fall in a range (0.5 mm or less) so that the sterilizing and deodorizing effect by a photocatalytic reaction on the surface of the heat insulating layer can reach the surface of the cover body.SELECTED DRAWING: Figure 2【課題】殺菌・消臭作用が確実で全面において均一に行われる断熱シートを提供する。【解決手段】この発明の断熱シートは、織布，不織布，フェルト，和紙その他の繊維状材料よりなるシート状の基材１と、該基材１の少なくとも片面に塗布又は含浸され、微細粒径でガラス質の中空ビーズ２ａ及び光を反射する二酸化チタンを含む断熱塗料よりなる断熱層２と、該断熱層２の表面にシート状ホットメルト接着剤３により接着される透光性，通気性を備えた繊維状材料よりなるシート状のカバー体４とからなる断熱シートであって、カバー体４と断熱層２の表面とが共に平坦面に形成されて密着され、カバー体４の表面と断熱層２の表面間の厚みが断熱層表面における光触媒反応による殺菌・消臭作用が及ぶ範囲内に収まる厚み（０．５ｍｍ以下）に形成されている。【選択図】図２
