An inspection device comprising: an inspection table including an inspection tray on which an inspection target which is a set of a plurality of articles is placed; characterized by a vibration unit adapted to vibrate the inspection table; an imaging unit (4, 11) adapted to acquire images of the inspection target, which is placed on the inspection tray, in a first direction in which transparent side wall portions (10a, 10b) of the inspection tray face each other and a second direction in which the bottom of the inspection tray is seen straight; and a control unit adapted to determine whether the articles in the inspection target overlap each other, based on inspection target information comprising appearance information of each of the articles forming the inspection target and the image of the inspection target in the first direction, and adapted to operate the vibration unit in a case in which it is determined that the articles overlap each other, and adapted to detect an outline of articles in the inspection target to determine an unstable posture, wherein the appearance information comprises height information of each of the articles when the article is in a stable posture where the center of gravity is the lowest and comprises outline information of each of the articles in a case in which each of the articles in a stable posture where the center of gravity is the lowest is seen straight, when a maximum value of a height position of an upper end of each of the articles, which is in the image in the first direction, from the inspection table is H and a maximum value of the height of each of the articles included in the inspection target information is the control unit is adapted to determine that the articles overlap each other in a case in which H > h max is satisfied; and the control unit is adapted to determine whether there is an article in an unstable posture in the inspection target, based on the outline of each of the articles included in the inspection target information and the image of the inspection target in the second direction, and adapted to operate the vibration unit in a case in which it is determined that there is an article in the unstable posture. an inspection table including an inspection tray on which an inspection target which is a set of a plurality of articles is placed; characterized by a vibration unit adapted to vibrate the inspection table; an imaging unit (4, 11) adapted to acquire images of the inspection target, which is placed on the inspection tray, in a first direction in which transparent side wall portions (10a, 10b) of the inspection tray face each other and a second direction in which the bottom of the inspection tray is seen straight; and a control unit adapted to determine whether the articles in the inspection target overlap each other, based on inspection target information comprising appearance information of each of the articles forming the inspection target and the image of the inspection target in the first direction, and adapted to operate the vibration unit in a case in which it is determined that the articles overlap each other, and adapted to detect an outline of articles in the inspection target to determine an unstable posture, wherein the appearance information comprises height information of each of the articles when the article is in a stable posture where the center of gravity is the lowest and comprises outline information of each of the articles in a case in which each of the articles in a stable posture where the center of gravity is the lowest is seen straight, when a maximum value of a height position of an upper end of each of the articles, which is in the image in the first direction, from the inspection table is H and a maximum value of the height of each of the articles included in the inspection target information is the control unit is adapted to determine that the articles overlap each other in a case in which H > h max is satisfied; and the control unit is adapted to determine whether there is an article in an unstable posture in the inspection target, based on the outline of each of the articles included in the inspection target information and the image of the inspection target in the second direction, and adapted to operate the vibration unit in a case in which it is determined that there is an article in the unstable posture.