A rotary recording medium reproducing apparatus reproduces a rotary recording medium accommodated within a case, where the case has a jacket provided with a space for accommodating the rotary recording medium and an opening through which the rotary recording medium can enter and leave the jacket, and a lid member inserted through the opening of the jacket for closing the opening. The rotary recording medium reproducing apparatus comprises an inserting opening through which the case or an empty jacket is inserted, a turntable for rotating the rotary recording medium left within the reproducing apparatus when an operation is performed in which the case is inserted into the reproducing apparatus and then the jacket is pulled out from the reproducing apparatus, a lid member locking mechanism provided at an innermost part of the reproducing apparatus for locking and leaving the lid member within the reproducing apparatus when an operation is performed in which the case is inserted into the reproducing apparatus and then pulled out from the reproducing apparatus, and a lid member guiding mechanism for guiding the lid member locked by the lid member locking mechanism and left within the reproducing apparatus and correcting the position of the lid member so that the lid member opposes the opening of the jacket at an intermediate point of insertion of an empty jacket, when the empty jacket is inserted into the reproducing apparatus to recover the rotary recording medium within the reproducing apparatus into the jacket.