Provided is a thermostatic container that improves both the communication radio wave transmissivity and keeping cold performance of a thermostatic container. A thermostatic container includes: a vacuum heat insulating container; a vacuum heat insulating lid configured to close the vacuum heat insulating container; a box body housed inside the vacuum heat insulating container; a box lid configured to close the box body; and a phase change material provided on a bottom portion and a wall portion of the box body and the box lid. An area made of a radio wave transmissive organic substance is provided on a path leading from inside of the box body to outside of the heat insulating container.