[Problem] To provide a valved catheter comprising a slit that opens readily in both directions either when a fluid is caused to flow from the interior to the exterior thereof or when a fluid is caused to flow from the exterior to the interior thereof, and that prevents inadvertent closure thereof from the opened state. [Solving Means] A valve 13 comprising an openable slit 14 that penetrates from the inner surface to the outer surface of a distal end section of a valved catheter 10 with a closed distal end, and edge portions 15, 16 on the two sides of the slit 14, is formed along the direction in which the valved catheter 10 extends. The slit 14 describes a linear .shape in the cross-section of the distal end section of the valved catheter 10 that extends in a position away from a centre line "c" that passes through the centre of the valved catheter 10 in parallel with this centre line "c" whereupon, accordingly, either one of the edge portions 16 or 15 deforms more readily than either one of the other edge portions 15 or 16.
