Manufacturing method of three-dimensional object

A method for manufacturing a three-dimensional object, the method comprising;

• forming a plurality of first unit layers on a plate, each first unit layer of the plurality of first unit layers being configured with a plurality of first layers that are stacked on each other in a first direction, each first layer of the plurality of first layers having a first thickness along the first direction, two adjacent unit layers of the plurality of first unit layers being spaced apart from each other via a space;
• forming a plurality of second unit layers in the spaces between the two adjacent unit layers of the plurality of first unit layers so as to form a first group of unit layers on the plate, each second unit layer of the plurality of second unit layers being configured by a single second layer, the single second layer having a second thickness in the first direction;
• and
• repeating the formation of the plurality of first unit layers and the formation of the plurality of second unit layers a plurality of times on a previously formed group of unit layers,
• wherein the second thickness is larger than the first thickness, and
• a first height in the first direction of each first unit layer of the plurality of first unit layers is equal to a second height in the first direction of each second unit layer of the plurality of second unit layers.