A disc reproducing apparatus is disclosed in which a large or small disc inserted through a disc inserting opening is transferred to a predetermined position within a player, a clamper arm extending over a turntable on which the disc is placed is operated to fix the disc onto the turntable, and information recorded in the disc is reproduced by rotating the turntable. A disc guide plate for guiding the small-diameter disc to a clamp position is pivotally mounted to the clamper arm. A disc guiding recess is provided into which the small disc can slip and which has a sufficiently wide opening. A restraining member blocks the advancement of only the large disc into the disc guiding recess. When the small disc is inserted through the disc inserting opening, the small-diameter disc is advanced into the disc guiding recess to be positioned at the clamp position. When the large-diameter disc is inserted through the disc inserting opening, the large-diameter disc is guided by the restraining member to the outside of the disc guiding recess, pushes away the disc guide plate, and is guided to the clamp position on the turntable.