An article transport apparatus includes a traveling portion configured to travel along a rail portion and a mounting portion configured to have a structure suspended under a traveling portion to mount articles thereon, in particular, the rail portion includes a plurality of first straight rails extending in a first direction while being arranged parallel to each other at first intervals, a plurality of second straight rails extending in a second direction perpendicular to the first direction while being arranged parallel to each other at second intervals, and a connecting rail configured to connect between the first straight rails and the second straight rails, which perpendicularly face each other, so that the traveling portion travels between the first straight rails and the second straight rails perpendicularly facing each other.