A waste disposal apparatus includes: a waste accommodating main body that has a film attachment portion in its upper region, and stores a waste material that is placed therein; a film accommodating cassette having a cylindrical tubular core that forms a waste inlet at its upper end, a lower flange that extends radially outward from a lower end of the tubular core, and a cylindrical film that is positioned so as to surround the tubular core and is accommodated so as to be compressed in an axial direction of the tubular core; and a cassette coupling mechanism for detachably attaching the film accommodating cassette to the film attachment portion.