A conveying device in which articles supplied intermittently in a plurality of rows are discharged continuously in a single row, comprising a rotational conveying mechanism and a reciprocating driving mechanism. The rotational conveying mechanism rotationally conveys numerous empty-bag holding members disposed at equal intervals in one direction along a ring-form track (or race-track path) which has a pair of parallel sections, and the reciprocating driving mechanism causes the rotational conveying mechanism as a whole to perform a reciprocating movement through a specified distance along the parallel sections of the ring-form track. On a supply side of the parallel sections, the empty-bag holding members are moved intermittently by a distance that is equal to an integral multiple of an attachment spacing of the empty-bag holding members; while on a discharge side of the parallel sections, the empty-bag holding members are moved continuously at a constant speed. Empty bags are supplied to the empty-bag holding members when the empty-bag holding members are stopped on the supply side, and these empty bags are discharged downward from the empty-bag holding members on the discharge side of the parallel sections and inserted into grooves of retainers that are conveyed at a constant speed.