An electronic equipment includes one or more electronic devices, a cold stage, and a cold insulation member. The one or more electronic devices perform a predetermined operation within a predetermined temperature range. The cold stage cools down the one or more electronic devices to a predetermined operational temperature at which the one or more electronic devices is operable. The phase transition temperature of the cold insulation member is in a range between the predetermined operational temperature and an upper limit of the predetermined temperature range. The cold insulation member is arranged adjacent to the one or more electronic devices, and retains the temperature of the one or more electronic devices within the predetermined temperature range. At least one electronic devices over which the cold insulation member is arranged is partially formed from a material which is in a superconductive state at the predetermined operational temperature.