Abstract: A marking device is described which is adapted to be mounted on one side of a tape measure which is comprised of a tape housing having a measuring tape coiled therein for extension therefrom through a tape issuing opening. The marking device comprises a support which is secured to one side of the tape measure housing and which extends forwardly therefrom. An elongated upstanding tubular housing is positioned on the forward end of the support with the lower end of a tubular housing being positioned laterally of the tape issuing opening. A marking member is selectively vertically mounted in the tubular housing which is adapted to be moved downwardly into marking contact with the article being measured.