Abstract: A film-chamber cover of an advanced photo system (APS) camera is for indicating whether a film cassette is loaded within a film chamber of the APS camera or not. The film-chamber cover includes: a bottom cover furnished with a viewing window, an upper cover furnished with a shaft hole, a moving shaft slidably connected with the shaft hole between the upper and bottom covers, and a swing plate formed with characteristic symbols thereon. The swing plate is pivoted to the bottom cover and is driven by a restoring member such that when the film chamber is not loaded with a film cassette, the swing plate can be restored to a position where a symbol indicating emptiness of the chamber aligns the window of the bottom cover.