The present invention relates to a measuring device for the amount of body fat burned and, more particularly, to a measuring device capable of detecting acetone contained in a user's exhaled gas and measuring the amount of body fat burned. The present invention provides a measuring device for the amount of body fat burned, the measuring device for the amount of body fat burned comprising: a sample gas passage through which exhaled gas flows； a sample gas chamber comprising an inlet through which a part of the exhaled gas flowing through the sample gas passage is introduced, and an outlet through which the introduced exhaled gas is discharged, wherein the sample gas chamber forms an inner space through which the exhaled gas flows； a photoionic detector (PID) disposed in the inner space of the sample gas chamber and generating an electrical signal according to the amount of acetone contained in the exhaled gas inside the sample gas chamber； and a heater configured to increase the temperature of the inner space of the sample gas chamber in order to prevent moisture contained in the exhaled gas from condensing in the sample gas chamber. The measuring device for the amount of body fat burned according to the present invention can measure the amount of body fat burned in real time, and the measurement time is a few seconds and thus is very short. Therefore, there is an advantage in that a user who is on a diet and is exercising for the purpose of weight loss can be informed in real time of whether body fat is being burned or not.La présente invention concerne un dispositif de mesure pour la quantité de graisse corporelle brûlée et, plus particulièrement, un dispositif de mesure capable de détecter l'acétone contenue dans le gaz expiré par l'utilisateur et de mesurer la quantité de graisse corporelle brûlée. La présente invention concerne un dispositif de mesure de la quantité de graisse corporelle brûlée, le dispositif de mesure de la quantité de graisse corporelle brûlée
