A smart belt are provided. The smart belt includes a body having a front surface and side surfaces and allowing a strap to be inserted through the side surfaces to be movable in a first direction, a gear unit provided in the body and configured to adjust an amount of tightening of the strap, and a cover configured to cover a rear surface of the body, wherein the gear unit includes a first shaft provided in a second direction intersecting with the first direction and having a first gear, and a second shaft intersecting with the first shaft and having a second gear engaged with the first gear, wherein the amount of tightening of the strap is adjusted as a rotation force of the second shaft is transferred to the first shaft through the first and second gears.
