[Problem] There is provided an image diagnosis catheter capable of preventing a solution from an internal space of a hub from flowing into a portion communicating with the internal space of the hub and to which the signal lines such as the optical fiber and the electric signal cable are electrically or optically connected.[Means for Resolution] An optical diagnostic catheter (100) according to the present invention includes an rotatable drive shaft (140) in which an optical transmitter and receiver (145b) and an ultrasound transmitter and receiver (145a) are disposed on a distal portion, and an optical fiber (143) connected to the optical transmitter and receiver and an electric signal cable (142) connected to the ultrasound transmitter and receiver are disposed, an elongated sheath (110) configured to be inserted into a biological lumen, into which the drive shaft can be inserted, and the elongated sheath including a lumen (110a) through which a solution flows, a hub (160) that includes a port (162) connected to the sheath for supplying the solution, and an internal space (166) communicating with the lumen of the sheath, through which the solution flows, and the optical fiber and the signal line are inserted, a connector portion (165) that includes an optical connector (165a) accommodated in the internal space of the hub and optically connected to an external optical connector provided in an external device (300) and the optical fiber, and an electrode terminal (165b) electrically connected to an external electrical connector provided in the external device and an electric signal cable, a first seal portion that prevents the solution from the port from flowing into a first connection portion between the optical connector and the optical fiber, and a second seal portion that prevents the solution from the port from flowing into a second connection portion between the electric signal cable and the electrode terminal.
