Provided is a radiation detection cassette that can suppress an artifact resulting from scattered radiation generated within a housing and can further achieve weight reduction and improvement in corrosion resistance. The radiation detection cassette includes a radiation detector that detects radiation, and a housing that houses the radiation detector. A back housing part of the housing opposite to a radiation exposure side is formed of an alloy containing Mg and Li and containing 0.1 mass % or more of Li. A protective film is provided in a portion or all of an outer surface of the back housing part.
