A box-packing system comprising: a conveyance apparatus; a robot configured to suck, hold, and transport an article packaged with a soft packaging material and conveyed by the conveyance apparatus; and a control device configured to control the robot to move the article to a box-packing preparation area, the robot having: a suction part configured to suck and hold the article from above; and an arm (34a, 34b, 34c) configured to move the suction part in a horizontal direction and an up-down direction; and a drive part configured to drive the arm, the control device having an acquisition part configured to acquire thickness information of the article, characterized in that: the box-packing system further comprises an evening part configured to flatly even the article; the acquisition part is configured to acquire the thickness information of the article evened by the evening part; the drive part is configured to drive the arm in order for the suction part to suck and hold the article at a predetermined height location; and the control device further has a determination part configured to determine the predetermined height location on the basis of the thickness information such that the predetermined height location corresponds to the thickness of the article, and a command generation part configured to generate a command to drive the drive part on the basis of the predetermined height location determined by the determination part. a conveyance apparatus; a robot configured to suck, hold, and transport an article packaged with a soft packaging material and conveyed by the conveyance apparatus; and a control device configured to control the robot to move the article to a box-packing preparation area, the robot having: a suction part configured to suck and hold the article from above; and an arm (34a, 34b, 34c) configured to move the suction part in a horizontal direction and an up-down direction; and a drive part configured to drive the arm, a suction part configured to suck and hold the article from above; and an arm (34a, 34b, 34c) configured to move the suction part in a horizontal direction and an up-down direction; and a drive part configured to drive the arm, the control device having an acquisition part configured to acquire thickness information of the article, characterized in that: the box-packing system further comprises an evening part configured to flatly even the article; the acquisition part is configured to acquire the thickness information of the article evened by the evening part; the drive part is configured to drive the arm in order for the suction part to suck and hold the article at a predetermined height location; and the control device further has a determination part configured to determine the predetermined height location on the basis of the thickness information such that the predetermined height location corresponds to the thickness of the article, and a command generation part configured to generate a command to drive the drive part on the basis of the predetermined height location determined by the determination part. the box-packing system further comprises an evening part configured to flatly even the article; the acquisition part is configured to acquire the thickness information of the article evened by the evening part; the drive part is configured to drive the arm in order for the suction part to suck and hold the article at a predetermined height location; and the control device further has a determination part configured to determine the predetermined height location on the basis of the thickness information such that the predetermined height location corresponds to the thickness of the article, and a command generation part configured to generate a command to drive the drive part on the basis of the predetermined height location determined by the determination part. a determination part configured to determine the predetermined height location on the basis of the thickness information such that the predetermined height location corresponds to the thickness of the article, and a command generation part configured to generate a command to drive the drive part on the basis of the predetermined height location determined by the determination part.