PROBLEM TO BE SOLVED: To provide a film for heat insulation without having aggregation of particles of a moisturizer, excellent in dispersibility, and improved in heat insulation even when reducing a dosage of the moisturizer.SOLUTION: The film for heat insulation contains 0.5-5 pts.wt. of an anhydrous magnesium carbonate based on 100 pts.wt. of a polyolefin-based resin, and is used for an agricultural greenhouse or the like.【課題】保湿剤粒子の凝集がなく、分散性が良好で、保温剤の添加量を少なくとも保温性を向上させた保温フィルムを提供すること。【解決手段】ポリオレフィン系樹脂１００重量部に対して無水炭酸マグネシウムを０．５～５重量部含有し、農業用ハウスなどに用いられる保温用フィルム。【選択図】 なし
