Provided is a box-type structure which comprises a simple structure having neutron beam shielding performance, and in which it is possible to accommodate an organism to be irradiated. A box-type structure (10) is provided with shielding plates comprising a lithium-fluoride sintered body having neutron shielding performance, wherein edge portions of the shielding plates (1), (2), (3), (4), (5) are joined by abutting against one another. The edge portions of the shielding plates have a halving joint structure, and the halving joint structure preferably has a stepped or inclined cutout shape. The box-type structure has a plurality of surfaces, and at least one of the surfaces may be removable or there may be an opening portion (20) in part of said surface.本發明所欲解決的問題在於提供一種箱型結構體，其能夠容置照射對象也就是生物體，且是由具有中子射線的遮蔽功能之簡單的結構所構成。本發明是一種箱型結構體，該箱型結構體10具備遮蔽板，該遮蔽板是由具有中子遮蔽功能之氟化鋰的燒結體所構成，並且前述遮蔽板1、2、3、4、5的端部經對接而接合。前述遮蔽板的端部具有嵌接結構，前述嵌接結構較佳是其切口形狀呈階梯狀或傾斜狀。前述箱型結構體具有複數個面，並且可以是至少一個以上的前述面能夠裝卸、或是可以在前述面的一部分上具有開口部20。
