To provide a washing device for a tube stock which is capable of preventing the generation of the chips generated as the tube stock is vibrated by the water pressure of high-pressure water and improving the production yield of photosensitive drums.

With this washing device, the tube stock 1 is placed on a contact member 11 which is fixed to a supporting member 6 and consisting of rubber, etc. A supporting member 5 is pressed by the contact member 11 which is lowered together with a contact member 10 by an air cylinder 8, by which the tube stock 1 is fixed. When a motor 9 rotates, the tube stock 1 and the supporting member 5 are rotated together with the supporting member 6 and the high-pressure water W containing a detergent is injected from a nozzle 20 connected to a high-pressure pump toward the cylindrical surface of the tube stock 1, by which the washing is executed.