The present invention relates to a biosignal measuring device comprising: two pairs of electrodes for measuring a biosignal of at least a portion of a user's body； a measuring unit for measuring at least one of body composition, electrocardiogram, and Pulse Transmit Time (PTT) of a human body from the two pairs of electrodes； a three-axis acceleration sensor for sensing a sensing value associated with a change in a user's measurement posture in three axes； and a control unit for determining a measurement posture of the biosignal using the sensing value sensed by the three-axis acceleration sensor, wherein the measurement unit determines the at least one of the body composition, the electrocardiogram, and the PTT of the human body using a first condition, if the measurement posture is in a first mode, and determines the at least one of the body composition, the electrocardiogram, and the PTT using a second condition different from the first condition if the measurement posture is in a second mode. According to the present invention, when it is difficult to accurately measure the biosignal while wearing a band-type biosignal measuring device, the biosignal can be measured accurately even in a low temperature and low humidity environment by converting a biosignal measurement mode from a wear mode to a non-wear mode and measuring the biosignal under conditions corresponding to the non-wear mode.La présente invention concerne un dispositif de mesure de biosignal comprenant : deux paires d'électrodes pour mesurer un biosignal d'au moins une partie du corps d'un utilisateur ； une unité de mesure pour mesurer au moins l'une parmi la composition corporelle, l'électrocardiogramme et le Temps de Transmission de Pulsation (PTT) d'un corps humain à partir des deux paires d'électrodes ； un capteur d'accélération à trois axes pour détecter une valeur de détection associée à un changement de posture de mesure de l'utilisateur dans trois axes ； et une unité de commande pour détermin
