A position adjusting mechanism, straddling a holding section for rotatably holding rollers and an opposed holding section for holding an opposed member disposed opposite to the rollers, wherein mutual positions between the holding section and the opposed holding section are adjusted, whereby mutual positions between the rollers and the opposed member are adjusted, the position adjusting mechanism including: a revolution sustainment structure provided at an end on one side in the longitudinal direction of the rollers and rotatably sustaining the opposed holding section with respect to the holding section; and a slide sustainment structure sustained at another end on the other side in the longitudinal direction of the rollers at two or more positions and sustaining the opposed holding section with respect to the holding section in a slidable manner.