The subject innovation is in operation together with the weight value measured by automatically measuring the kidney using ultrasound on the Body Mass Index height scale that can display a body mass index (BMI). The height scale of the subject innovation is the distance detecting mechanism for receiving the signal (ultrasound) section is installed on the main body side of the scales send upwardly the distance detection signal (ultrasonic, etc.) and reflection for measuring height; And the user's head position yirumyeonseo the main body and the horizontal scale reflects a distance detection signal (ultrasound) is directly configure measurements to be able to measure the height can measure the weight and height at the same time, by calculating a body mass index therefrom It can be displayed. Here, the distance detection mechanism is an ultrasonic sensor for transmitting and receiving an ultrasonic wave, comprises an ultrasonic sensor with a sliding means or capable of decompression means so as to slide in the forward / rearward from the main body, the measurement bars are brought into the wall itself Place measure or measures self riding the guide rail and the guide rail is configured as measured by placing the bar measured in a horizontal or attached to the guide rail and the wall which is attached to the wall surface on the head of the blood contact point moves up and down automatically or manually by an ultrasonic It can be configured as a reflector capable of reflecting. Therefore, BMI height scale according to the present invention, measures the only reflected by the bar measured in a state where ultrasonic waves are kept horizontal transmitted from the ultrasonic sensor can be obtained, an accurate measurement value, by operating in a way of extending the ultrasonic sensor and the body fat can be easily measured, or even big ones, can be implemented at low cost.
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