PURPOSE:To allow the radiography of the right coronary artery with one kind by using the catheter having a catheter body of a specific outside diameter and constituting this body, successively from its root end side, of a 1st straight part, a curved S-shaped part, a 2nd straight part in succession thereto, and a front end part which is curved in the angle formed with the 2nd straight part toward the inner side at a specific angle. CONSTITUTION:The outside diameter of the catheter body 2 is =2.1mm in 800 to 950mm of the entire length. The catheter body 2 is constituted, successively from its root end side, of the 1st straight part 21, the curved S-shaped part 22, the 2nd straight part in succession thereto and the front end part 24 in succession thereto. The 1st straight part 21 is substantially straight in the state of not exerting external force thereto and the length L1 thereof is not particularly limited. The S-shaped part 22 exhibits the smoothly curved S shape in the state of not exerting external force thereto and while the length L2 thereof is not particularly limited, L1+L2 is preferably =120mm. The 2nd straight part 23 is substantially straight in the state of not exerting external force thereto and is preferably specified to the length L3=20 to 60mm. The front end 24 is curved to the inner and the angle alpha formed with the 2nd straight part is 90 to 115 deg..
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