PURPOSE: To provide a barrel type polishing device capable of polishing small articles without damaging them and in a short time in a barrel type polishing device, in the barrel tank of which small articles are contained with chips and polished.

CONSTITUTION: A barrel tank 1 uses a cylindrical body 3 whose cross section is a circle, and inner plates 4, 4... are spaced at a specified interval in the internal periphery of this cylindrical body 3, and each inner plate 4 has a cross area projected toward the center of this cylindrical body 3, and the tilt angle of the barrel tank 1 can be adjusted.