Recoater, additive manufacturing apparatus including the same, and additive manufacturing method

A recoater that is to be used in an additive manufacturing apparatus based on a powder bed fusion method in which a powder material laid on or above an additive manufacturing section is selectively fused to form a fused body and the fused body is sequentially stacked, and moves over the additive manufacturing section to form a layer of the powder material on or above the additive manufacturing section,

• the recoater comprising:
• a powder retention section that defines a retention space in which the powder material is retained;
• and
• a slit part that is provided on the powder retention section and has a slit inlet that receives the powder material retained and a slit outlet through which the powder material is discharged,
• wherein the slit part includes a plate member fixed to the powder retention section by surface contact, and
• a pair of slit inner wall surfaces that is connected to the slit outlet and faces each other is formed within a plate thickness of the plate member.