A supporting device is provided and includes: an upright column; a protruding neck arranged on the upright column; a spindle rod unit with a main spindle rod fixed on the protruding neck along a second axis; a first rotating rod; a carrying board unit having a first frame pivoted on the main spindle rod, the first frame having a first upper half part and a first lower half part, the first rotating rod passing through one of the first upper half part and the first lower half part and being able to rotate relative to the main spindle rod with the second axis as an axis; a first fin set being sleeved on the main spindle rod and the first rotating rod; a first friction set stacked alternately with the first fin set; and an elastic element set connected to the protruding neck and the carrying board unit.