A catheter comprising: an elongated tubular body possessing an outside diameter (D1) of from 1.35 to 3 mm and an inside diameter (d1), the tubular body possessing a cross-sectional area in the direction perpendicular to the longitudinal direction of the catheter main body of (π × [(D1/2) 2 - (d1/2) 2 ]); the tubular body comprising a distal end portion and a proximal end portion , and being comprised of an inner layer forming an inside surface of said tubular body, an outer layer forming an outside surface of said tubular body, and a plurality of reinforcing wires between said inside surface and said outside surface; said reinforcing wires each possessing a length, a thickness (d2) substantially parallel to a radial direction of said tubular body and a width substantially perpendicular to said thickness (d2), said plurality of reinforcing wires together possessing a total cross-sectional area; said tubular body possesses a ratio of the outside diameter (D1) of said tubular body to the thickness (d2) of said reinforcing wires from 55 to 65, wherein a ratio of the inside diameter (d1) to the outside diameter (D1) of said tubular body is from 0.85 to 0.91, and said tubular body possesses a wall thickness (D2), and a ratio of the wall thickness (D2) of said tubular body to the thickness (d2) of said reinforcing wires is from 3.5 to 3.8, characterized in that said tubular body possesses a proportion of the total cross-sectional area of said plurality of reinforcing wires to the cross-sectional area of said tubular body which is less than 25%, but not less than 17%, and said tubular body has been subjected to surface roughening. an elongated tubular body possessing an outside diameter (D1) of from 1.35 to 3 mm and an inside diameter (d1), the tubular body possessing a cross-sectional area in the direction perpendicular to the longitudinal direction of the catheter main body of (π × [(D1/2) 2 - (d1/2) 2 ]); the tubular body comprising a distal end portion and a proximal end portion , and being comprised of an inner layer forming an inside surface of said tubular body, an outer layer forming an outside surface of said tubular body, and a plurality of reinforcing wires between said inside surface and said outside surface; said reinforcing wires each possessing a length, a thickness (d2) substantially parallel to a radial direction of said tubular body and a width substantially perpendicular to said thickness (d2), said plurality of reinforcing wires together possessing a total cross-sectional area; said tubular body possesses a ratio of the outside diameter (D1) of said tubular body to the thickness (d2) of said reinforcing wires from 55 to 65, wherein a ratio of the inside diameter (d1) to the outside diameter (D1) of said tubular body is from 0.85 to 0.91, and said tubular body possesses a wall thickness (D2), and a ratio of the wall thickness (D2) of said tubular body to the thickness (d2) of said reinforcing wires is from 3.5 to 3.8, characterized in that said tubular body possesses a proportion of the total cross-sectional area of said plurality of reinforcing wires to the cross-sectional area of said tubular body which is less than 25%, but not less than 17%, and said tubular body has been subjected to surface roughening. <EOS>