To prevent remaining of a remaining object and occurrence of vibration and noise.

A conveyance conveyor 7 for conveying a conveyance object supplied into a grain conveyance passage 18 in a machine case 1 long in the direction of conveyance is provided and is constituted by providing a plurality of conveyance bodies 12 at a predetermined interval at an endless chain 13. The respective conveyance body 12 is integrally formed on a pair of both side links 25 of the endless chain 13 by synthetic resin and is constituted by forming a lower side conveyance body part 12B for connecting an upper side conveyance body parts 12A on the left and right sides below an upper side conveyance body part 12A having an inclined slide contact face 21 coming into slide-contact with an inclined supporting plate part 20. The respective conveyance body 12 and the grain conveyance passage 18 are constituted to bring a partial unspecific conveyance body 12 in the plurality of conveyance bodies 12 into contact with an inner face of the grain conveyance passage 18 relatively.