An image diagnosis catheter comprising: a rotatable drive shaft in which an optical transmitter and receiver and an ultrasound transmitter and receiver are disposed on a distal portion, and an optical fiber connected to the optical transmitter and receiver and a signal line connected to the ultrasound transmitter and receiver are disposed; an elongated sheath configured to be inserted into a biological lumen, into which the drive shaft is inserted, and the elongated sheath including a lumen through which a solution flows; a hub that includes a port supplying the solution to the lumen of the sheath, and an internal space (166, 166a) communicating with the lumen (1 10a) of the sheath, through which the solution from the port flows and the optical fiber and the signal line are inserted; a connector portion that includes an optical connector accommodated in the internal space (166, 166a) of the hub and optically connected to an external optical connector provided in an external device and the optical fiber, and an electrical connector electrically connected to an external electrical connector provided in the external device and the signal line; 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 signal line and the electrical connector, characterized in that the connector portion further includes a connection member attaching the optical connector, the connection member includes an insertion part having a cavity through which the optical fiber is inserted from a distal end to a proximal end, and the first seal portion includes a filler filled in the cavity of the insertion part. a rotatable drive shaft in which an optical transmitter and receiver and an ultrasound transmitter and receiver are disposed on a distal portion, and an optical fiber connected to the optical transmitter and receiver and a signal line connected to the ultrasound transmitter and receiver are disposed; an elongated sheath configured to be inserted into a biological lumen, into which the drive shaft is inserted, and the elongated sheath including a lumen through which a solution flows; a hub that includes a port supplying the solution to the lumen of the sheath, and an internal space (166, 166a) communicating with the lumen (1 10a) of the sheath, through which the solution from the port flows and the optical fiber and the signal line are inserted; a connector portion that includes an optical connector accommodated in the internal space (166, 166a) of the hub and optically connected to an external optical connector provided in an external device and the optical fiber, and an electrical connector electrically connected to an external electrical connector provided in the external device and the signal line; 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 signal line and the electrical connector, characterized in that the connector portion further includes a connection member attaching the optical connector, the connection member includes an insertion part having a cavity through which the optical fiber is inserted from a distal end to a proximal end, and the first seal portion includes a filler filled in the cavity of the insertion part.