Additive manufacturing method

An additive manufacturing method of manufacturing a product by laminating metal, the additive manufacturing method comprising:

• laminating the metal so as to form a half-finished product of the product and a support;
• spraying dry ice pellets having a particle shape to the support, after the laminating;
• and
• removing the support by pulverizing at least a part of the support, after the spraying,
• wherein the support includes:
• a first region including a joint surface joined to the half-finished product;
• and
• a second region other than the first region;
• wherein the laminating includes forming the first region as a porous body having a plurality of holes into which each of the dry ice pellets is capable of entering at least partially, and
• wherein the removing includes:
• pulverizing the first region by spraying the dry ice pellets to the first region;
• and
• removing a remainder which remains unpulverized after the pulverizing.