An optical fiber cable unit has an optical fiber cable obtained by binding a plurality of optical fibers and transmits a laser beam using transmission paths having the optical fibers, respectively. The optical fiber cable unit includes: an input-side connection unit that inputs the laser beam to the optical fibers; a one-end-side connection unit fixed to one end of the optical fiber cable and connected to the input-side connection unit; an other-end-side connection unit fixed to the other end of the optical fiber cable; and an output-side connection unit to which the other-end-side connection unit is connected and in which the laser beam from the optical fibers is output. The input-side connection unit has a switching mechanism that switches the transmission paths for transmitting the laser beam.