Provided is a stethoscope including: a detection unit that detects a vibration caused by a sound which is generated from an object to be measured and that outputs a vibration signal on the basis of the vibration; an output unit that outputs a sound signal on the basis of the vibration signal; an output terminal from which the sound signal is output to an outside; and three electrocardiographic electrodes each of which is disposed around the detection unit and detects cardiac electrical activity of the object to be measured, in which the output terminal is disposed on an axis passing through a center of one predetermined electrocardiographic electrode out of the three electrocardiographic electrodes and a center of the detection unit.