To provide a cold insulating material capable of keeping a cooling effect for a long time and easily adjusting temperature.SOLUTION: The coolant 100 is composed of a cold insulation material 1, a heat insulating sheet 2 arranged on at least one side so as to enclose the cold insulation material, and a package 3 for sealing by holding a cool material wrapped with a heat insulating sheet . The coolant is taken out before freezing the cold insulation material, takes it out, holds the heat insulating face 1 a in his hand, and applies the cooling face 1 c to the skin to perform the desired cooling. Since the heat insulating sheet is also provided near the edge of the cooling surface 1 c, the heat of the finger is prevented from being transferred to the cold insulating material, and by placing the heat insulating surface 1 a so as to be in contact with the surface of the bag or the container, Since the transmission of heat can also be prevented, the cooling effect can be maintained for a long time. Moreover, it is possible to easily adjust the temperature by merely turning over the heat insulating surface on which the heat insulating sheet is provided and the cooling surface not provided.BACKGROUND OF THE INVENTION【課題】冷却効果を長く維持でき、温度調整が簡単にできる保冷材を提供する。【解決手段】冷却材100は、保冷材1と、保冷材を包むように少なくとも一面側に配置した断熱シート2と、断熱シートで包んだ保冷材を入れて封止するパッケージ3とから構成される。冷却材は、予め保冷材を冷凍させてから取り出し、断熱面1aを手に持って冷却面1cを肌に当て、所望の冷却を行う。断熱シートが冷却面1cの端縁近傍にも設けられているので、指の熱が保冷材に伝わるのが防止され、断熱面1aをカバンや入れ物の面に接するように置くことで保冷材に熱が伝わるのも防止できるので、冷却効果を長く維持できる。また、断熱シートが設けられている断熱面と設けられていない冷却面とをひっくり返すだけで簡単に温度調整ができる。【選択図】図1
