To transfer a conveying body between conveying passages as well as to provide a plurality of conveying passages for conveying the conveying body.

In conveyor system 10 to be used in a medical laboratory, a conveying body on which a test tube is placed is conveyed through a first conveying passage 11 and a second conveying passage 12. Respective conveying passages 11, 12 rotationally drive a pair of endless conveying belts 48, place a conveying body on the conveying belts 48, and convey it. A specified conveying body is transferred from the first conveying passage 11 to the second conveying passage 12 by a first transfer device 52. A specified conveying body is transferred from the second conveying passage 12 to the first conveying passage 11 by a second transfer device 52. Sensors for discriminating identification codes of the conveying bodies are provided on respective transfer devices 51, 52.