PROBLEM TO BE SOLVED: To perform image diagnosis for communicating with an inner space of a hub and preventing liquid from flowing from the inner space of the hub to a portion where a signal line such as an optical fiber or an electric signal cable is electrically or optically connected. Provide a catheter. An image diagnostic catheter (100) according to the present invention has an optical transmission / reception unit (145b) and an ultrasonic transmission / reception unit (145a) arranged at a distal end thereof, and an optical fiber (143) connected to the optical transmission / reception unit. ) And an electric signal cable (142) connected to the ultrasonic transmitter / receiver, and a rotatable drive shaft (140) configured to be inserted into a living body lumen, the drive shaft being insertable, and , An elongated sheath (110) having a lumen (110a) through which a liquid can flow, a port (162) connected to the sheath for supplying a liquid, and communicating with the lumen of the sheath to allow the liquid to flow and light. A hub (160) having an internal space (166) through which a fiber and a signal line pass, and an external optical connector housed in the internal space of the hub and provided to an external device (300). And a connector section (165) including an optical connector (165a) optically connected to the optical fiber, and an electrode terminal (165b) electrically connected to an external electrical connector and an electrical signal cable provided in an external device. And a first seal portion for sealing liquid flowing from the port to the first connecting portion between the optical connector and the optical fiber, and liquid flowing from the port flowing to the second connecting portion between the electric signal cable and the electrode terminal. A second seal portion for sealing the work.【課題】ハブの内部空間と連通し、光ファイバや電気信号ケーブル等の信号線が電気的又は光学的に接続される部位にハブの内部空間からの液体が流通することを防止できる画像診断用カテーテルを提供する。【解決手段】本発明に係る画像診断用カテーテル（１００）は、光送受信部（１４５ｂ）および超音波送受信部（１４５ａ）が先端部
