direction opposite to the advancing direction of the needle 21 a this can decrease the possibility of the cell aggregate to be dragged by the needle 21 a into the cell tray 14 according to the present invention the position of the cell aggregate to be pierced with the needle 21 a can be controlled to produce a cell structure with any shape for example with reference to fig1 the device for producing a cell structure can also produce a three dimensional cell structure having a hollow structure the shape and the size of the hollow structure may arbitrary be designed for example a wall surface can be formed with cell aggregates with a hollow inside to produce a cylindrical tunnel like three dimensional cell structure when a three dimensional cell structure produced has a hollow structure the lowering length of the needle 21 a toward the cell aggregate is determined according to the size of the hollow structure specifically the lowering length is decreased for a length corresponding to the size of the hollow structure this allows a space to be provided for a length corresponding to the size of the hollow structure between the cell aggregate 101 a and the cell aggregate 101 b the resultants.