PROBLEM TO BE SOLVED: To reduce labor for operation and prevent occurrence of temperature range deviation in a constant-temperature transport container which is small and light-weight and maintains a temperature of an object in a narrow range.SOLUTION: A heat transmission container 14 houses an object such as a sample. Heat accumulation agents 61 and 62 make heat contact with the heat transmission container 14 and is disposed at the inner side of the heat transmission container 14. Cold insulators 51 to 56 make heat contact with the heat transmission container 14 and is disposed at the outer side of the heat transmission container 14. A heat insulation container 11 houses the heat transmission container 14, the heat accumulation agents 61 and 62, and cold insulators 51 to 56.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT