A radiation imaging apparatus, comprising a sensor panel on which a plurality of sensors are arrayed, a scintillator that is arranged over a base member and is made of an alkali halide, and a protective film configured to suppress deliquescence of the scintillator, wherein the protective film includes a first portion that covers a side face of the scintillator and an end of the scintillator on a side opposite to the base member, and a second portion that is smaller in a content of fluorine than the first portion and covers at least part of a surface of the first portion.