Method of manufacturing three-dimensional shaped object and three-dimensional shaping device

A three-dimensional shaping device comprising:

• a shaping machine configured to stack a shaping material;
• a cutting machine having a cutting tool configured to cut a first length in a cutting direction;
• and
• a control unit configured to control the shaping machine and the cutting machine, wherein
• the control unit
• causes the shaping machine to stack the shaping material to shape a first portion having a length in the cutting direction shorter than the first length;
• causes the cutting machine to cut the first portion in the cutting direction using the cutting tool;
• and
• causes the shaping machine to discharge the shaping material to couple to a first end surface of the first portion in a direction opposite to the cutting direction, and to shape a second portion having a length in the cutting direction shorter than that of the first portion.