An infrared thermometer, comprising a handheld part; a head connected to the handheld part, the head comprising a bottom shell; an infrared sensor configured to measure the temperature of an object to be measured; a holder configured to hold the infrared sensor to the bottom shell; a housing configured to accommodate the infrared sensor and the holder and to be joined to the bottom shell; a first conductor arranged on the housing; and characterized by a second conductor (116, 216, 316, 416, 616, 716) arranged between the first conductor and the handheld part and adjacent to the holder; wherein the first conductor generates a first signal because of a capacity effect formed when approaching to a surface of the object to be measured and the second conductor (116, 216, 316, 416, 616, 716) generates a second signal because of a capacity effect formed when approaching to a surface of an object not desirable to be measured; and a microcontroller configured to activate a measurement of the temperature based on the first signal generated by the first conductor or inactivate a measurement of the temperature based on the second signal generated by the second conductor (116, 216, 316, 416, 616, 716); wherein the microcontroller converts the first signal representing a capacitance value into a corresponding distance value for determining the distance between the head of the infrared thermometer and the object to be measured; the microcontroller activates the measurement of the temperature of the object when the distance value falls within a preset range of the distance value; and the microcontroller inactivates the measurement of the temperature when the capacitance value represented by the second signal exceeds a threshold value. a handheld part; a head connected to the handheld part, the head comprising a bottom shell; an infrared sensor configured to measure the temperature of an object to be measured; a holder configured to hold the infrared sensor to the bottom shell; a housing configured to accommodate the infrared sensor and the holder and to be joined to the bottom shell; a first conductor arranged on the housing; and characterized by a second conductor (116, 216, 316, 416, 616, 716) arranged between the first conductor and the handheld part and adjacent to the holder; wherein the first conductor generates a first signal because of a capacity effect formed when approaching to a surface of the object to be measured and the second conductor (116, 216, 316, 416, 616, 716) generates a second signal because of a capacity effect formed when approaching to a surface of an object not desirable to be measured; and a bottom shell; an infrared sensor configured to measure the temperature of an object to be measured; a holder configured to hold the infrared sensor to the bottom shell; a housing configured to accommodate the infrared sensor and the holder and to be joined to the bottom shell; a first conductor arranged on the housing; and characterized by a second conductor (116, 216, 316, 416, 616, 716) arranged between the first conductor and the handheld part and adjacent to the holder; wherein the first conductor generates a first signal because of a capacity effect formed when approaching to a surface of the object to be measured and the second conductor (116, 216, 316, 416, 616, 716) generates a second signal because of a capacity effect formed when approaching to a surface of an object not desirable to be measured; and a microcontroller configured to activate a measurement of the temperature based on the first signal generated by the first conductor or inactivate a measurement of the temperature based on the second signal generated by the second conductor (116, 216, 316, 416, 616, 716); wherein the microcontroller converts the first signal representing a capacitance value into a corresponding distance value for determining the distance between the head of the infrared thermometer and the object to be measured; the microcontroller activates the measurement of the temperature of the object when the distance value falls within a preset range of the distance value; and the microcontroller inactivates the measurement of the temperature when the capacitance value represented by the second signal exceeds a threshold value.