A radiological image detection apparatus includes: a lock mechanism including at least one first lock mechanism and at least one second lock mechanism, each including a coupling member moving between a coupling position at which the lock mechanism is coupled to a battery and a non-coupling position, the coupling member being installed with a manipulation part exposed to an outer surface of a portion of a case in which a battery accommodating part is installed, and the first lock mechanism setting a first direction of a movement direction of the corresponding coupling member from the coupling position to the non-coupling position and the second lock mechanism setting a second direction of a movement direction of the corresponding coupling member from the coupling position to the non-coupling position, being different from the first direction.
