A radiation detecting device in which defective adhesion between an adhesive member and end portions of a plurality of sensor substrates is reduced.
A radiation detecting device includes a plurality of sensor substrates disposed adjacent to each other, each sensor substrate including a side surface that connects a first surface, where a plurality of photoelectric converting elements are arranged in an array, and an opposing second surface to each other; a scintillator disposed at a side of the first surfaces of the plurality of sensor substrates; and a sheet-like adhesive member for adhering the plurality of sensor substrates and the scintillator to each other, wherein, between the plurality of sensor substrates, the sheet-like adhesive member adheres to the first surfaces and at least portions of the side surfaces such that the sheet-like adhesive member extends and continuously adheres from the first surfaces to the at least portions of the side surfaces.