A management tray unit in which an image that allows reliable detection for each individual containing region may be obtained even with an imaging system and a degree of freedom of dividing a tray into individual containing regions is high. A composite partition member includes a base portion and a plurality of partition portions arranged in parallel with a predetermined interval. A connecting wall portion configured to connect one end of each of the partition portions is provided at the composite partition member. A space formed among the partition portion, the partition portion, and the connecting wall portion constitutes one individual containing region. A space formed by the partition portion and the connecting wall portion on the side of a second side of the base portion constitutes one individual containing region together with the partition portion of another composite partition member or a side wall of a tray.
