<；P>；PROBLEM TO BE SOLVED: To provide a warmth-keeping sheet which is lightweight, is excellently flexible, shows excellence in workability, particularly workability in cultivating a plurality of plants, has excellent warmth-keeping property, particularly warmth-keeping property at night, and is suitable for cultivating the plants particularly suitable for mitigating a temperature decrease in a tunnel for a plastic tunnel culture in the morning. <；P>；SOLUTION: The warmth-keeping sheet obtained by laminating a nonwoven fabric on a film is transparent, is non-gas-permeable, has a uniform thickness, has a bulk density of 0.05 to 0.45 g/cm<；SP>；3<；/SP>；, and has a basis weight of 45 to 145 g/m<；SP>；2<；/SP>；wherein the nonwoven fabric is composed of a fiber having a fiber diameter of 6.0 to 30.0 &mu；m. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
