According to one embodiment, a radiation detection apparatus includes a radiation detection panel, a support member that is configured to support the radiation detection panel on one surface thereof and has electrical conductive property, a circuit board that is supported on the other surface of the support member, a flexible circuit board configured to electrically connect the radiation detection panel to the circuit board, a heat insulation member arranged between the radiation detection panel and the circuit board, a housing that is configured to accommodate the radiation detection panel, the circuit board, the support member, and the heat insulation member and has electrical conductive property, and a heat conduction member that is accommodated in the housing, connected to the support member and the housing, and configured to achieve electrical conduction between the support member and the housing to conduct heat of the support member to the housing.