Drum for a shot blasting apparatus and shot blasting apparatus

A drum for a shot blasting apparatus that carries out treatment of works to be treated by injecting particles for treatment into the drum, while the drum, into which the works to be treated are supplied, rotates, comprising:

• a hollow middle part;
• a lower-half part having a shape of a cone, a circular truncated cone, or U-shape, and having a closed bottom;
• a convex part that is connected to the lower-half part and whose height is less than that of the lower-half part;
• and
• a projecting part for agitating that is connected to both the lower-half part and the middle part, and that agitates the works to be treated:
• wherein the middle part of the drum has a cylindrical shape, a shape of a hollow polygonal pillar or a combination of a cylinder and a hollow polygonal pillar;
• wherein the convex part of the drum has a shape of a circular cone, a circular truncated cone, a square pyramid, a square pyramid of trapezoidal shape, a pyramid, or a pyramid of a trapezoidal shape;
• wherein the projecting part for agitating of the drum has at least two surfaces, one being the surface for picking-up the works to be treated and the other being the surface for having the works slide down;
• and
• wherein an angle between the surface for picking up and the surface for having the works slide down is from 60° to 120°.