The present invention addresses the problem of transferring a fly stably in a sewing machine in which the fly and a slide fastener chain are sewn together. A fly sewing machine of the present invention is provided with: a fly transfer device (20) which transfers a fly (5); a chain transfer device (30) which transfers a slide fastener chain (3) toward the fly being transferred by the fly transfer device; and a sewing machine (40) which sews together the fly and the slide fastener chain in an overlapping state. The fly transfer device is provided with three belt conveyors of which respective belts (23) are arranged in parallel along a transfer direction. The three belt conveyors include a center conveyor (21A) and two side conveyors (21B) arranged on both sides thereof. The center conveyor transfers the fly to the upstream side with respect to the sewing machine. The side conveyors transfer the fly from the upstream side to the downstream side with respect to the sewing machine.
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