A transfer system comprising: a transport vehicle configured to move along a rail provided on a ceiling for moving an article; and a placement portion disposed below the rail, having a predetermined position on which the article can be placed; wherein the transport vehicle has a transfer unit (21, 22, 23, 24) configured to hold the article on the placement portion and to place the article onto the placement portion, the transfer unit (21, 22, 23, 24) is configured to transfer the article between the transport vehicle and the placement portion in a lateral transfer manner, the transfer system further comprising: a memory configured to store (i) placement position information indicating a transfer position of the article when the transfer unit (21, 22, 23, 24) is to place the article onto the placement portion, and (ii) holding position information indicating a transfer position of the article when the transfer unit (21, 22, 23, 24) is to hold the article on the placement portion; and a controller configured to control the transfer unit (21, 22, 23, 24) such that, when the transfer unit (21, 22, 23, 24) is to place the article, the article is transferred at a transfer position indicated in the placement position information in the memory and, when the transfer unit (21, 22, 23, 24) is to hold the article, the article is transferred at a transfer position indicated in the holding position information in the memory; characterised in that the placement position information and the holding position information are each indicated as sum of a common data indicating a transfer position common among a plurality of transport vehicles and a unique data indicating a transfer position unique to each transport vehicle; and in that the difference between the unique data of the placement position information and the unique data of the holding position information corresponds to an offset amount of the article calculated based on inclination degree of the article and a height of the article at the transfer position. a transport vehicle configured to move along a rail provided on a ceiling for moving an article; and a placement portion disposed below the rail, having a predetermined position on which the article can be placed; wherein the transport vehicle has a transfer unit (21, 22, 23, 24) configured to hold the article on the placement portion and to place the article onto the placement portion, the transfer unit (21, 22, 23, 24) is configured to transfer the article between the transport vehicle and the placement portion in a lateral transfer manner, the transfer system further comprising: a memory configured to store (i) placement position information indicating a transfer position of the article when the transfer unit (21, 22, 23, 24) is to place the article onto the placement portion, and (ii) holding position information indicating a transfer position of the article when the transfer unit (21, 22, 23, 24) is to hold the article on the placement portion; and a controller configured to control the transfer unit (21, 22, 23, 24) such that, when the transfer unit (21, 22, 23, 24) is to place the article, the article is transferred at a transfer position indicated in the placement position information in the memory and, when the transfer unit (21, 22, 23, 24) is to hold the article, the article is transferred at a transfer position indicated in the holding position information in the memory; characterised in that the placement position information and the holding position information are each indicated as sum of a common data indicating a transfer position common among a plurality of transport vehicles and a unique data indicating a transfer position unique to each transport vehicle; and in that the difference between the unique data of the placement position information and the unique data of the holding position information corresponds to an offset amount of the article calculated based on inclination degree of the article and a height of the article at the transfer position. a memory configured to store (i) placement position information indicating a transfer position of the article when the transfer unit (21, 22, 23, 24) is to place the article onto the placement portion, and (ii) holding position information indicating a transfer position of the article when the transfer unit (21, 22, 23, 24) is to hold the article on the placement portion; and a controller configured to control the transfer unit (21, 22, 23, 24) such that, when the transfer unit (21, 22, 23, 24) is to place the article, the article is transferred at a transfer position indicated in the placement position information in the memory and, when the transfer unit (21, 22, 23, 24) is to hold the article, the article is transferred at a transfer position indicated in the holding position information in the memory; characterised in that the placement position information and the holding position information are each indicated as sum of a common data indicating a transfer position common among a plurality of transport vehicles and a unique data indicating a transfer position unique to each transport vehicle; and in that the difference between the unique data of the placement position information and the unique data of the holding position information corresponds to an offset amount of the article calculated based on inclination degree of the article and a height of the article at the transfer position.