Provided are: a cell tray provided with a concave part for supporting a cell aggregate and a hole formed on the bottom of the concave part; and a device for producing a cell structure, said device being provided with the cell tray and a puncture part passing through the cell tray and the cell aggregate, characterized in that the puncture part passes through the cell aggregate supported by the concave part until the tip thereof intrudes into the hole. Also provided is a system for producing a cell structure, said system comprising: a determination part that examines the characteristics of cell aggregates; a fractionation part that classifies the cell aggregates depending on the results of the examination by the determination part; a discharge part that disposes the cell aggregates in a cell tray depending on the results of the classification by the fractionation part; a puncture part that pass through a plurality of cell aggregates disposed in the cell tray; and a holding part that aligns and holds a plurality of puncture parts passing through a plurality of cell aggregates.