(EN) Provided is a foreign substance capturing device for capturing a foreign substance, which can expand the diameter of a capturing member to an appropriate size. The foreign matter catching tool 10 is for catching foreign matter in the lumen, and is movably arranged on the core wire 20 and outside the core wire 20, and its tip end is regulated to move to a predetermined position of the core wire 20. A capturing member 30 that expands in diameter by contracting in the axial direction, and a tubular member 50 that is disposed outside the core wire 20 and on the proximal end side of the capturing member 30 and that restricts movement of the capturing member 30 on the proximal end side. A control member 60 that is disposed outside the core wire 20 and inside the capturing member 30 and that controls the amount of contraction of the capturing member 30 in the axial direction, and relatively moves the tubular member 50 and the core wire 20. Then, the capturing member 30 contracts in the axial direction by the length regulated by the control member 60 and expands in diameter.異物を捕捉する捕捉部材を適切な大きさに拡径することができる、管腔内の異物捕捉具を提供する。この異物捕捉具１０は、管腔内の異物を捕捉するものであって、芯線２０と、芯線２０の外側に移動可能に配置されると共に、その最先端が芯線２０の所定位置に移動規制され、軸方向に縮まることにより拡径する捕捉部材３０と、芯線２０の外側で且つ捕捉部材３０の基端側に配置され、捕捉部材３０の基端側の移動を規制する筒状部材５０と、芯線２０の外側で且つ捕捉部材３０の内側に配置され、捕捉部材３０の軸方向における縮み量を規制する制御部材６０とを有し、筒状部材５０と芯線２０とを相対的に移動させることで、捕捉部材３０が制御部材６０で規制された長さで軸方向に縮まって拡径する。
