A catheter capable of accurately closing an opening of an accommodation hole of a pressure sensor filled with a pressure transmission medium, easily obtaining a structure capable of highly sensitive pressure detection, and improving productivity. Providing the tip of. SOLUTION: A first opening 42a for pressure detection formed in a tip surface 40a on the side of a distal end 1A and a second opening 45a for filling a pressure transmission medium 70 formed on the side of a proximal end 1B. In the tip chip 40 in which the optical sensor 50 is housed in the optical sensor housing hole 42 having the opening 42b and the pressure transmission medium 70 is filled, the second opening 42b is sealed by the sealing portion 80, and at least sealed. The surface of the area that covers the portion 80 and the first opening 42a is covered with the covering portion 90. [Selection diagram] Figure 4【課題】圧力伝達媒体を充満させた圧力センサの収容孔の開口を的確に塞ぐことができるとともに、高感度の圧力検知ができる構造を容易に得ることができ、生産性の向上が図られるカテーテルの先端チップを提供する。【解決手段】遠位端１Ａ側の先端面４０ａに形成された圧力検知用の第１の開口４２ａと、近位端１Ｂ側に形成された圧力伝達媒体７０の充填口４５である第２の開口４２ｂとを有する光センサ収容孔４２に光センサ５０が収容されるとともに圧力伝達媒体７０が充満される先端チップ４０において、第２の開口４２ｂを封止部８０により封止し、少なくとも封止部８０および第１の開口４２ａを覆う領域の表面を被覆部９０により被覆する。【選択図】図４
