Method of manufacturing product and additive manufacturing apparatus

A method of manufacturing a product, the method comprising:

• a powder-layer forming step in which a layer forming portion moves in a space above a base and forms a powder layer having a predetermined thickness;
• a solidifying step in which the powder layer formed in the powder-layer forming step is irradiated with an energy beam in accordance with a shape of a product to be manufactured and a solidified portion is formed;
• and
• a check step in which whether a projecting portion is formed on the solidified portion formed in the solidifying step is checked, the projecting portion having a height larger than the predetermined thickness,
• wherein the powder-layer forming step, the solidifying step, and the check step are repeated in this order,
• wherein if the projecting portion is detected in the check step, the layer forming portion operates in the powder-layer forming step to be performed next, such that
• until reaching a position located in front of the projecting portion, the layer forming portion moves while forming the powder layer having the predetermined thickness by using a high-rigidity thickness-determining portion,
• at a position of the projecting portion, the layer forming portion moves while forming the powder layer by using a low-rigidity thickness-determining portion, and
• after passing the position of the projecting portion, the layer forming portion moves while forming the powder layer having the predetermined thickness by using the high-rigidity thickness-determining portion.