A storing system (1, 1A) comprising: a traveling rail (2, 2A) including a plurality of first rails (21, 21A) extending in a first direction and a plurality of second rails (22, 22A) extending in a second direction orthogonal to the first direction, the first rails (21, 21A) and the second rails (22, 22A) being disposed in a grid pattern on the same plane to form lengthwise and crosswise a plurality of areas each of which is surrounded by a pair of the first rails (21, 21A) adjacent to each other and a pair of the second rails (22, 22A) adjacent to each other; a vehicle (3, 3A) including a traveling unit (31, 31A) configured to travel on the traveling rail (2, 2A) in both directions of the first direction and the second direction and a transfer unit configured to hold an article to raise and lower the article; and a storage unit, provided below the traveling rail (2, 2A), on which the article is to be placed, wherein the traveling rail (2, 2A) further includes a plurality of intersection rail members constituting intersection portions of the first rails (21, 21A) and the second rails (22, 22A), the vehicle (3, 3A) is configured to deliver and receive the article to and from the storage unit, the storage unit includes a plurality of rack units (40, 40A) adjacent to each other, each of the rack units (40, 40A) includes a placement member (51, 51A) on which the article is to be placed, is provided such that the placement member (51, 51A) is positioned directly below the corresponding area, and is detachable from the traveling rail (2, 2A), the storing system (1, 1A) further comprises a plurality of brackets (25, 65) respectively provided to the intersection rail members, each of the brackets (25, 65) allows the four rack units (40, 40A) disposed on four corners of the corresponding intersection rail member to be detachable, and each of the rack units (40, 40A) is detachable from the traveling rail (2, 2A) through the four brackets (25, 65) respectively positioned on four corners of the rack unit (40, 40A). a traveling rail (2, 2A) including a plurality of first rails (21, 21A) extending in a first direction and a plurality of second rails (22, 22A) extending in a second direction orthogonal to the first direction, the first rails (21, 21A) and the second rails (22, 22A) being disposed in a grid pattern on the same plane to form lengthwise and crosswise a plurality of areas each of which is surrounded by a pair of the first rails (21, 21A) adjacent to each other and a pair of the second rails (22, 22A) adjacent to each other; a vehicle (3, 3A) including a traveling unit (31, 31A) configured to travel on the traveling rail (2, 2A) in both directions of the first direction and the second direction and a transfer unit configured to hold an article to raise and lower the article; and a storage unit, provided below the traveling rail (2, 2A), on which the article is to be placed, wherein the traveling rail (2, 2A) further includes a plurality of intersection rail members constituting intersection portions of the first rails (21, 21A) and the second rails (22, 22A), the vehicle (3, 3A) is configured to deliver and receive the article to and from the storage unit, the storage unit includes a plurality of rack units (40, 40A) adjacent to each other, each of the rack units (40, 40A) includes a placement member (51, 51A) on which the article is to be placed, is provided such that the placement member (51, 51A) is positioned directly below the corresponding area, and is detachable from the traveling rail (2, 2A), the storing system (1, 1A) further comprises a plurality of brackets (25, 65) respectively provided to the intersection rail members, each of the brackets (25, 65) allows the four rack units (40, 40A) disposed on four corners of the corresponding intersection rail member to be detachable, and each of the rack units (40, 40A) is detachable from the traveling rail (2, 2A) through the four brackets (25, 65) respectively positioned on four corners of the rack unit (40, 40A).