The food preservation method uses food film (34A), and (34B) saves food. Food film (34A), (34B) has a surface, the surface has multiple raised (34Ap), (34Bp), and protruding portion (34Ap), it is food film (34A) when watching from the normal direction greater than 20 to less than 500, (34B) that (34Bp), which has two-dimensional range,. On the surface that food directly contacts.