A measuring apparatus uses a biological component sensor including a plate-shaped sensor chip having a biological component sensing function and a sensor chip holding frame surrounding and holding the sensor chip. The biological component sensor is disposed in a measuring apparatus main body housing. A fixed engaging member and movable engaging member disposed on a sensor chip support table fixed to the measuring apparatus main body housing fix and support the sensor chip holding frame, and the sensor chip can be thus replaced. The biological component sensor contacts a forearm portion of a human body, and a biological component exuded from a contact part of the forearm portion is caused to contact the sensor chip to change a physical or chemical surface property of the sensor chip, thereby measuring the change through an irradiation of an inspection light to calculate concentration of the biological component.