To improve the quality of a marking line drawn on a member and shorten time for the drawing operation of the marking line by improving the dimensional precision of the marking line and preventing, for example, omission of and a dimensional error in the marking line.

A marking line drawing system comprises a conveying device 2 for conveying a member 1 in a fixed direction, a stopping device 3 for stopping the conveyed member 1 in a given position in the conveying direction D, fixing devices 4 for fixing the stopped member 1 in the position, and a drawing device 7 for reciprocating a drawing tool 6 held in a position adjusted to a surface 5 of the fixed member 1 to draw a marking line on the surface 5 of the member 1. The drawing device 7 holds the drawing tool 6 swingable in relation to the operating direction, and urges it in a direction to return it to a reference position P. The drawing device 7 holds two drawing tools 6 in parallel in the operating direction.