Has a X-ray shielding plate disposed between the support member and the X-ray source, a support for supporting the X-ray shielding plate, the X-ray shielding apparatus according to the present invention, in a vertical shielding plate moving plane for X-ray irradiation path and characterized by having an X-ray shielding plate exchange means for exchanging the X-ray shielding plates having different sizes, a shielding plate drive mechanism for moving the shield plate of the support portion, the X-ray shielding plate of the support member.本発明によるエックス線遮蔽装置は、エックス線源と支持部材との間に配置されるエックス線遮蔽板と、エックス線遮蔽板を支持する支持部を有し、エックス線照射経路に対して垂直な遮蔽板移動平面において支持部の遮蔽板を移動させる遮蔽板駆動機構と、支持部材のエックス線遮蔽板を、大きさの異なるエックス線遮蔽板に交換するためのエックス線遮蔽板交換手段とを有することを特徴とする。
