To collect a large number of multiply stacking objects being a bumper processed for capacity reduction in a substantially plate shape by being rolled by a rolling machine, in a laminated state.

This piling device includes a receiving means 1 for permitting storage in the laminated state of the large number of multiply stacking objects W, and a guide means 2 movably installed in an upper end part of the receiving means 1. The upper end part in the receiving means 1 has a rail 11 capable of installing and moving the guide means 2. This rail 11 has an inclination being an up-grade over the tip of this upper end part from the base end of this upper end part in the upper end part in the receiving means 1. The guide means retreats in the direction for climbing the up-grade by the external force action from the multiply stacking objects moved toward this guide means by a proper means, and advances in the direction for descending the up-grade when eliminating the external force action.

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