Abstract: A cassette (110), to be loaded with a photo film strip, has a photo film passageway (119) through which a leader (123) of the photo film strip (23, 111) is drawn out of a cassette shell. On a spool (112) is retained a trailer (124) of the photo film strip. A loader apparatus has a light-tight dark compartment (147). A rotary barrel (163) is rotatable, and partially fitted in an opening formed in a downstream wall of the dark compartment. Two cassette holders (164, 165) are disposed on the barrel and in respective positions opposite about a rotational axis (163a) of the barrel, and hold the cassette removably. The barrel is rotated to move the cassette holders into and out of the dark compartment. The cassette is supplied to one of the cassette holders located outside the dark compartment. The trailer of the photo film strip is passed into the photo film passageway in the cassette in one of the cassette holders located inside the dark compartment.