A column unit for an electric power steering apparatus, comprising: a steering column that comprises an outer column made of synthetic resin, and an inner column, which is located on the vehicle-rear side of the outer column, fits inside the outer column and can collapse toward the vehicle-front side during a secondary collision, and that supports a steering shaft on the inside thereof such that the steering shaft can rotate; a lower support bracket that is integrally formed with the vehicle-front side of the outer column or a portion that is integrally formed with the vehicle-front side of the outer column so as to protrude upward toward the vehicle-top side, and comprises a lower installation hole that is formed parallel with a horizontal axis line that is orthogonal to the center axis of the outer column; a metal lower installation bolt that is inserted through the lower installation hole, and is for fastening the lower support bracket to a metal lower vehicle installation plate that is fastened to a vehicle body; and an upper support bracket that is formed on the vehicle-rear side of the outer column and comprises an upper installation hole; characterized in that the upper support bracket is formed so as to protrude upward toward the vehicle-top side, and the upper installation hole is formed parallel with a horizontal axis line that is orthogonal to the center axis of the outer column; and the column unit further comprises a metal upper installation bolt that is inserted through the upper installation hole, and is for fastening the upper support bracket to a metal upper vehicle installation plate that is fastened to the vehicle body. a steering column that comprises an outer column made of synthetic resin, and an inner column, which is located on the vehicle-rear side of the outer column, fits inside the outer column and can collapse toward the vehicle-front side during a secondary collision, and that supports a steering shaft on the inside thereof such that the steering shaft can rotate; a lower support bracket that is integrally formed with the vehicle-front side of the outer column or a portion that is integrally formed with the vehicle-front side of the outer column so as to protrude upward toward the vehicle-top side, and comprises a lower installation hole that is formed parallel with a horizontal axis line that is orthogonal to the center axis of the outer column; a metal lower installation bolt that is inserted through the lower installation hole, and is for fastening the lower support bracket to a metal lower vehicle installation plate that is fastened to a vehicle body; and an upper support bracket that is formed on the vehicle-rear side of the outer column and comprises an upper installation hole; characterized in that the upper support bracket is formed so as to protrude upward toward the vehicle-top side, and the upper installation hole is formed parallel with a horizontal axis line that is orthogonal to the center axis of the outer column; and the column unit further comprises a metal upper installation bolt that is inserted through the upper installation hole, and is for fastening the upper support bracket to a metal upper vehicle installation plate that is fastened to the vehicle body.