The invention provides a chain conveyor system capable of avoiding damages and vibration noise by securely attracting and retaining metallic magnetic articles in inclined conveyor lines or slippery wet conveyor lines and of providing ready transfer or relay of the articles to other conveyors or equipment also in a conveyor terminal carry-out area. The chain conveyor system comprises a conveyor chain having article-attracting magnet pieces for attracting and retaining articles on loading surfaces thereof and an article-separating device that is disposed coaxially with a sprocket wrapped by and engaging with the conveyor chain and has article-separating magnet pieces that cut the attraction of the article-attracting magnet pieces with the articles on an outer circumferential parts of a free roller.