To shorten accumulating time by providing a device with a control means controlling a moving means so that a first supporting piece may move from a prescribed location in response to a detection output of a detection means and a second supporting piece may move up to the prescribed location within fixed time intervals.

Sheet bodies S are fed one by one to a first supporting piece 12a at a prescribed location by a feeding means 2 at fixed time intervals. As a result, the sheet bodies S are accumulated in the first supporting piece 12a. When the fed sheet bodies S become a prescribed number of sheets, the effect is detected by a detection means 3. Further, the first supporting piece 12a moves from the prescribed location in response to a detection output of a detection means 4 by the control of a moving means 1 by a control means 4 and a second supporting piece 12b moves to the prescribed location within fixed time intervals. In this state, next sheet bodies S are accumulated in the second supporting piece 12b in the same way as the first supporting piece 12a. Thus, time required for the preparation of the next accumulation can be shortened.