A camera module includes a lens barrel and a lens holder. The lens barrel includes a first tubular section and a second tubular section. The first tubular section extends from an end of the second tubular section. The outer diameter of the first tubular section tapers in a direction from the image side to the object side of the lens barrel. The lens holder includes a third tubular section and a fourth tubular section. The third tubular section extends from an end of the fourth tubular section. The outer diameter of the third tubular section tapers in a direction from an image side to an object side of the third tubular section. The lens barrel threadedly inserts into the lens holder and is held by the lens holder.