A disc loading mechanism transporting a disc between a disc cartridge and a recording and reproducing apparatus includes: a loading arm having at a leading end thereof claw members which comes into contact with an outer circumference of the disc and performs drawing of the disc into the recording and reproducing apparatus and insertion of the disc into the disc cartridge; an arm driving mechanism which slides the loading arm in a disc transport direction; a disc extruding lever which extrudes the disc up to a contact position with the claw members when discharging the disc; and a lever driving mechanism which drives the extrusion lever, wherein each of the claw members includes a draw-in surface portion and an insertion surface portion provided at the opposite side to the draw-in surface portion.