The present invention is a bed, a plurality of far-infrared irradiation hole vertically penetrates through the irradiation hole and the far-infrared ray directly irradiated by the human body; A bed frame having a plurality of bar-shaped openings formed at regular intervals on a side of the bed, and having a vertical groove penetrating a lower end of the opening; A tension spring is formed on both sides of the bed frame by forming a body including an upward guide part in which a spring coupling hole is formed, a horizontal guide part in which a bolt coupling hole is formed, and the upward guide part and a horizontal guide part. A height adjustment hinge having a frame support part formed therein to prevent the detachment by tension when connected; A height adjusting bolt inserted into the vertical groove of the opening and the bolt coupling hole of the horizontal guide part, and being elevated by rotating; A fixing nut attached and fixed in the vertical groove; A snap ring inserted into the height adjusting bolt to prevent the height adjusting bolt from falling out of the height adjusting hinge; And a tension spring that raises and lowers the height-adjusting hinge as the height-adjusting hinge moves up and down, thereby relieving the height of the mattress according to the contact portion of the human body.
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