To provide a compact and inexpensive dividedly packed product accumulation device capable of catching up with high speed on a conveyance line getting in a partially vacant state due to delivery of defective products.

A replenishing stocker 20 is arranged on a downstream side of the conveyance line 12 to replenish a vacant position with a dividedly packed product W. When the number of sheets of the dividedly packed product W to be stored is small, the replenishing stocker 20 takes the conveyed dividedly packed product W into the replenishing stocker 20, and when there are the required number of sheets, the replenishing stocker 20 takes the dividedly packed product W in the replenishing stocker 20 out of the replenishing stocker 20 to replenish the vacant position with it. In an accumulation part 17, the whole row of dividedly packed products W where the sets W1 of dividedly packed products are accumulated by the prescribed number or the accumulation part 17 remains in an empty condition with the dividedly packed product W not accumulated are together fed into a following process P.