Powder supply device and additive manufacturing device

A powder supply device comprising:

• a hopper accommodating powder;
• a cylindrical roller provided below the hopper and rotatable around a rotational axis;
• and
• a wall surface facing a peripheral surface of the roller and storing the powder in a space between the roller and the wall surface, wherein
• the powder stored between the roller and the wall surface is moved in a rotation direction of the roller and dropped by the roller rotating,
• a plurality of groove portions extending in an axial direction are formed in the peripheral surface of the roller,
• at least one of the plurality of groove portions is formed having an axial extent such that a capacity allowing the powder to be accommodated changes in the axial direction;
• and
• stuffing material selectively fitted into the at least one of the plurality of grooves that reduces the capacity thereof, wherein the stuffing material is selectively fitted into the axial extent of the at least one of the plurality of grooves.