An onion peeler and an onion peeling member constituting the onion peeler are disclosed. According to the disclosed onion peeler and the onion peeling member constituting the onion peeler, the onion peeler comprises an onion transport conveyor member, an onion peeling member, a by-product transport conveyor member and a by-product guide member. Therefore, by-products, such as onion skin separated from the onions to be transferred along the onion transport conveyor member, can be discharged to the outside by the onion transport conveyor member after being guided by the by-product guide member, and thus the present invention can resolve a phenomenon in which by-products are caught in the by-product transport conveyor member and the like so as to cause breakdowns.