PURPOSE: To make compact and lightweight a shaft lock device, to eliminate the application of oil and the like such as grease oil, etc., and, at the same time, manufacture it at a low cost.

CONSTITUTION: The shaft lock device 1 is constituted of an inside shaft 2 of metal and an outside shaft 3 of resin formed together with the inside shaft 2 as a molding unit. A small diameter section for preventing the movement of the inside shaft 2 to the outside shaft 3 in the direction of the axis is formed in the shaft section of the inside shaft 2 inserted into the outside shaft 3.