The present invention calculates the body mass using ultrasound in conjunction with the weight value measured by automatically measuring the height relates to the body mass index scale that can represent the height index (BMI). The height scale is distance sensing mechanism of the present invention for measuring the height of the part installed on the main body side to the upper side of the scale transmits the distance detection signal (ultrasonic, etc.) and receive a reflected signal (ultrasound); And the provision of the main body and the horizontal scale of the user's head position to reflect the distance detection signal (ultrasound) is measured immediately configured to be able to measure the height and the weight and height can be measured at the same time, to calculate the BMI therefrom can be displayed. Here, the distance detection mechanism is made up of a sliding means or means which can elongate the ultrasonic sensor and the ultrasonic sensor so as to slide in the forward / rearward from the main body to transmit and receive ultrasound, measurement bars are brought into the wall itself measured against the guide rails or measurer to measure the horizontal bar position by attaching the guide rail and the wall is attached to the wall by measuring configuration or on the head of the subject, take the guide rails automatically or manually moved up and down by the ultrasound may be of a reflective plate that can be reflected. Therefore, since the body mass index scale height in accordance with the present invention measures the reflected only by the measurement of the bar is held in the horizontal state ultrasound transmitted from the ultrasound sensor can obtain an accurate measurement value, by operating in a way of stretching the ultrasonic sensor There are a large person or body fat can easily be measured, can be implemented at low cost.
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