| 摘要 |
PURPOSE: A step board is provided, which can reduce unit cost, removes occurrence of malfunction, and improves durability. CONSTITUTION: A step board comprises a plurality of bars(111) which are equipped with a rotator in the bottom; a driving part(110) in which a front end of the bar is hinge-coupled and supports the bar to turn upward and downward and which is equipped with a first caster in the bottom; and a supporting plate(140) in which the front end is combined with the driving part to be rotatable and the site coping with the rotator is bent and which is equipped with a plurality of second casters in the bottom.
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