Mapping device and load port apparatus

A mapping device capable of detecting a stored state of a square shaped plate-form object comprising a plurality of square shaped plate-form objects stored in a container capable of storing the square shaped plate-form objects along a first direction while taking a space between each of the square shaped plate-form objects, comprising:

• a first detection part having a first detection axis which crosses a first side and a second side being approximately perpendicular to the first side of the square shaped plate-form object to detect a first corner thickness corresponding to a length along the first direction that the first detection axis is blocked by the square shaped plate-form object when the first detection axis moves along the first direction;
• a second detection part having a second detection axis which crosses the first side of the square shaped plate-form object and a third side positioned at an opposite side of the second side being approximately perpendicular to the first side to detect a second corner thickness corresponding to a length along the first direction that the second detection axis is blocked by the square shaped plate-form object when the second detection axis moves along the first direction;
• a first information acquiring unit acquiring a first information relating to a warpage amount in the first direction of the square shaped plate-form object;
• an adjustment calculation unit calculating an adjusted detection value relating to the thickness of the square shaped plate-form object in the first direction by adjusting, based on the first information, a sum of the first corner thickness and the second corner thickness of the square shaped plate-form object or an average of the first corner thickness and the second corner thickness;
• and
• a distinguishing unit distinguishing the stored state of the square shaped plate-form object using the adjusted detection value.