To ensure the collapse stroke length while ensuring the strength of the housing side when connecting a gear box housing of an electric power steering device with an inner column of the steering column responding to a telescope.

When a cylindrical part 14 for fitting the inner column 6 is provided in a protruding condition on the housing 13, an expanded part 16 whose diameter is larger than the small diameter part 15 of the projection end part is formed at the bedrock part of the cylindrical part 14, and the fitting end part of the inner column 6 is also expanded. The strength of the bed rock part of the cylindrical part 14 is improved. In addition, the corner roundness is applied between the small diameter part 15 and the expanded part 16 to reduce the stress concentration.