A blood analyzer capable of obtaining a blood analysis result instantaneously without sampling blood but rather applying a DC current to blood flowing through an artery and irradiating it with an ultrasonic wave is provided. It is equipped with a main measurement unit 110 having a positive electrode and a negative electrode placed apart from each other, ultrasonic wave transmitting/receiving probes, which are sandwiched between the positive electrode and the negative electrode and placed adjacent to the positive electrode and negative electrode, and ultrasonic wave transmitting probes placed sandwiched between the ultrasonic wave transmitting/receiving probes, each of which is protruding from the surface and, provided inside of the main measurement unit 110, a measuring control unit comprising: a DC application unit, a positive electrode and a negative electrode, an ultrasonic wave output unit, an ultrasonic wave reception unit, and a component analysis.
