Steering column and manufacturing method thereof

A steering column having an overall hollow and cylindrical shape, and comprising an outer column and an inner column fitted inside the outer column to relatively move in an axial direction of the steering column to the outer column, the outer column comprising:

• a main body portion made of a light metal alloy, the main body having one-side end section and another-side end section;
• and
• a cylindrical member made of an iron alloy, the cylindrical member having one-side end section and another-side end section, the cylindrical member being joined in an axial direction with respect to the main body portion with the other-side end section of the cylindrical member fitted inside and fastened to the one-side end section of the main body portion, an inner diameter of an end surface of the other-side end section of the cylindrical member being smaller than an inner diameter of a portion of the other-side end section of the cylindrical member, the portion of the other-side end section of the cylindrical member constituting a joined section between the main body portion and the cylindrical member;
• wherein
• the main body portion has a convex section or concave section on an inner circumferential surface of the one-side end section of the main body portion, and the cylindrical member has a concave section or convex section that is fitted inside and engages with the convex section or concave section of the main body portion on an outer circumferential surface of the other-side end section of the cylindrical member.