The utility model discloses a thermal imager, which comprises a machine main body and also comprises a wristband. A mounting base is arranged on the wristband. The machine main body is detachably connected with the mounting base. With the arrangement of the wristband, the thermal imager can be worn on the wrist. The infrared detection function of the thermal imager can be realized, and simultaneously it also can free users' hands up like wearing a watch, thus making users work more conveniently. According to the thermal imager provided by the utility model, as it is carried by the use of the wristband, portability of the thermal imager can be raised.