To provide a rotary kiln capable of reducing stress on a connecting portion of a kiln main body, and a charging pipe and an outlet pipe to prevent breakage of the connecting portion when a large-scaled kiln of heavy self-weight, or heavy treated powder and granular material is applied, in the rotary kiln utilizing a rotating supporting shaft as a contents taking-out means.

The charging pipe 4 extends into the kiln 1 at a contents charging side, a plurality of ribs 7 are disposed inside of a conical part 31, an outlet receiving pipe 30 extends into the kiln 1 at an outlet side, a plurality of ribs 7 are disposed inside of the conical part 31, an outlet pipe 6 is disposed through a protector 10 at the center, and a gutter 9 is mounted on a tip of the outlet pipe through a cap 3.