A conveyance device comprising: a first conveyance unit configured to detachably hold a plurality of conveyance objects and convey the plurality of conveyance objects along an endless loop-shaped first route extending in a predetermined plane; a second conveyance unit provided side by side with the first conveyance unit in a direction parallel to the predetermined plane, the second conveyance unit detachably holding a plurality of conveyance objects and conveying the plurality of conveyance objects along an endless loop-shaped second route extending in the predetermined plane; and a cover body forming a space in which the first conveyance unit and the second conveyance unit are accommodated, wherein the first route includes a first section and a second section, the second route includes a third section and a fourth section, a first opening used to attach and detach each of the conveyance objects to and from the first conveyance unit in the first section and a second opening used to attach and detach each of the conveyance objects to and from the second conveyance unit in the third section are provided in the cover body, the second section is located between the first section and the second conveyance unit in a direction in which the first conveyance unit and the second conveyance unit are arranged, and the fourth section is located between the third section and the first conveyance unit in the direction in which the first conveyance unit and the second conveyance unit are arranged, and the first opening and the second opening are opened in an identical plane of the cover body facing the predetermined plane. a first conveyance unit configured to detachably hold a plurality of conveyance objects and convey the plurality of conveyance objects along an endless loop-shaped first route extending in a predetermined plane; a second conveyance unit provided side by side with the first conveyance unit in a direction parallel to the predetermined plane, the second conveyance unit detachably holding a plurality of conveyance objects and conveying the plurality of conveyance objects along an endless loop-shaped second route extending in the predetermined plane; and a cover body forming a space in which the first conveyance unit and the second conveyance unit are accommodated, wherein the first route includes a first section and a second section, the second route includes a third section and a fourth section, a first opening used to attach and detach each of the conveyance objects to and from the first conveyance unit in the first section and a second opening used to attach and detach each of the conveyance objects to and from the second conveyance unit in the third section are provided in the cover body, the second section is located between the first section and the second conveyance unit in a direction in which the first conveyance unit and the second conveyance unit are arranged, and the fourth section is located between the third section and the first conveyance unit in the direction in which the first conveyance unit and the second conveyance unit are arranged, and the first opening and the second opening are opened in an identical plane of the cover body facing the predetermined plane.