There is provided a catheter which exhibits high operability while parts that can be connected and disconnected are provided. The catheter (1) includes: a sheath (2) which is inserted into a lumen a drive shaft (42) which is inserted into the sheath (2) and delivers mechanical drive force an image information acquiring unit (411) which is fixed to a distal end of the drive shaft (42) and acquires image information a hub (31) which moves while holding the drive shaft (42) and thereby moves the drive shaft (42) in an axial direction of the sheath (2) an outer tube (32) which is provided on a proximal end side of the sheath (2) and includes a first connector (372) at a proximal end thereof a second connector (35) which includes on a proximal end side of the outer tube (32) a male connector (352) that is able to be connected to and disconnected from the first connector (372) and an inner tube (34) which is provided on a distal end side of the hub (31), moves relatively with respect to the outer tube (32) in the outer tube (32) along with the movement of the hub (31), and includes at a distal end thereof a latch section (341) that is not able to pass through the second connector (35).
