A catheter that includes an inner layer forming the inner surface of a tubular catheter main body having a lumen, an outer layer forming the outer surface of the catheter main body, and multiple reinforcements embedded between the inner surface and the outer surface. The inner diameter of the catheter main body is D1, the outer diameter is D2, the wall thickness is T1, a thickness of each reinforcement is T2, an effective width of each reinforcement is W, and a total number of the multiple reinforcements is N. The catheter satisfies Expressions (1), (2), and (3):0.050 mm≦T1≦0.100 mm Expression (1)T2/T1≧0.25 Expression (2)60,000≦(D1×D2×W×N)/(T12×T2)<；1,000,000 Expression(3).
