A radiation detection device includes: a radiation detection panel; a supporting member having a first surface on which the radiation detection panel is provided; plural power supply units that are bonded to a second surface of the supporting member opposite to the first surface of the supporting member; a housing that accommodates the radiation detection panel, the supporting member, and the plural power supply units; and plural spacers that are provided on the second surface so as to protrude more than the plural power supply units and contact with a bottom of the housing which faces the second surface, the plural power supply units include a first power supply unit and a second power supply unit that are arranged at an interval in a first direction in the second surface, and the plural spacers are as defined herein.