Automatic Analysis Device, Cold Storage, and Method For Cooling Reagent in Automatic Analysis Device

Provided is an automatic analysis device, a cooling box, and a cooling method for a reagent in the automatic analysis device capable of suppressing dew condensation on the outside of the reagent cooling box without increasing an outer diameter of the cooling box and without affecting a reagent temperature. The automatic analysis device 100 is a device that is configured to measure physical properties of reaction liquid in which a sample and a reagent are dispensed respectively and reacted in a reaction container 30, and includes a reagent cooling box 24 that is configured to store a reagent container 106 housing the reagent, and a heating unit that is disposed on an outer peripheral part of the reagent cooling box 24 to heat the outer peripheral part.