A picking system comprising: a suction device including a suction hand that has a suction unit configured to suction a transport target article by negative pressure, and a pump that exerts the negative pressure onto the suction unit; a conveyor having a transporting surface; a moving device configured to move the suction hand from a placing unit on which the transport target article is placed to the transporting surface, the moving device including a turning-over section configured to rotate the suction hand around an axis in a horizontal direction perpendicular to a gravity direction, from an orientation in which the suction unit faces down along the gravity direction and a suction surface of the suction unit intersects the gravity direction; an imaging device configured to capture an image of the transport target article; the picking system being characterized by a control device configured to control the suction device and the moving device, wherein when it is determined based on the image obtained by the imaging device that the transport target article needs to be moved to the transporting surface with a front side and back side of the transport target article turned over, the control device causes the suction unit to suction the transport target article, the moving device to transport the transport target article to a position above the transporting surface, the turning-over section to set the suction hand to an orientation in which the transport target article is positioned above the suction unit in the gravity direction and a direction substantially orthogonal to the suction surface is inclined with respect to the gravity direction, and the suction unit to release the suction of the transport target article. a suction device including a suction hand that has a suction unit configured to suction a transport target article by negative pressure, and a pump that exerts the negative pressure onto the suction unit; a conveyor having a transporting surface; a moving device configured to move the suction hand from a placing unit on which the transport target article is placed to the transporting surface, the moving device including a turning-over section configured to rotate the suction hand around an axis in a horizontal direction perpendicular to a gravity direction, from an orientation in which the suction unit faces down along the gravity direction and a suction surface of the suction unit intersects the gravity direction; an imaging device configured to capture an image of the transport target article; the picking system being characterized by a control device configured to control the suction device and the moving device, wherein when it is determined based on the image obtained by the imaging device that the transport target article needs to be moved to the transporting surface with a front side and back side of the transport target article turned over, the control device causes the suction unit to suction the transport target article, the moving device to transport the transport target article to a position above the transporting surface, the turning-over section to set the suction hand to an orientation in which the transport target article is positioned above the suction unit in the gravity direction and a direction substantially orthogonal to the suction surface is inclined with respect to the gravity direction, and the suction unit to release the suction of the transport target article.