This instant disclosure provides an auxiliary thermometer being adapted for measuring a human body temperature between an arm and a trunk of a human body including a carrying module, a temperature measurement module, a control module and a fixed structure. The temperature measurement module includes a first temperature measurement unit disposed on the carrying module and a second temperature measurement unit opposite to the first temperature measurement unit and correspondingly disposed on the carrying module. The control module is disposed on the carrying module and electrically connected to the first temperature measurement unit and the second temperature measurement unit. The carrying module is disposed on the fixed structure to be disposed on the arm or the trunk of the human body.
