To provide a small-sized, inexpensive medal aligning device for a game machine into which medals loaded in bulk are automatically slotted one by one, and provide a medal aligning device for a game machine in which medals loaded in bulk are automatically slotted one by one without a drive source.

In the game machine where a medal is introduced into an introduction opening in a state rendering medal faces approximately vertical, the medal aligning device for the game machine is provided with a slide part placed above the introduction opening, slanting in one direction so that the medal slides down by weight thereof and having a width of at least twice a medal diameter in a direction intersecting the slanting direction at a right angle, a one-medal separating opening placed on an upper side of the slide part, having an opening size greater than thickness of a single medal and not greater than that of two medals and a guide part disposed on the downstream of the separating opening and guiding the medal passing through the separating opening approximately vertically.