A deposition apparatus is capable of checking, in real time, the thickness or uniformity of a thin layer which is formed. The deposition apparatus includes a moving unit to which a substrate is detachably fixed. A conveyer unit conveys the moving unit in a first direction or in an opposite direction to the first direction. A deposition unit includes at least one deposition assembly for depositing a deposition material on the substrate. A discharge data acquisition unit acquires data associated with the amount of the deposition material discharged per unit time from the at least one deposition assembly. A transmission unit transmits the data acquired by the discharge data acquisition unit.