Problem to be solved: To improve quality of Welsh onions. [Solution] a waste conveying device 1 includes an under-floor duct 40 disposed under the floor and having a conveying path for conveying processed waste generated by a processing device 102 for processing long Welsh onions, a scraper 13 disposed in the under-floor duct 40, having a tip end disposed close to a plate surface of a conveying plate 14, A horizontal conveyor 10 supporting the plurality of scrapers 13 and circulating and moving the scrapers 13 in the conveying direction, and a ventilation device 30 and a ventilation device 32 generating an air flow moving along the conveying path in the under-floor duct 40. Selected drawing: Figure 1
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