A cable holder includes a pair of holding members that are relatively moved in a predetermined sliding direction to sandwich and hold a cable therebetween. The pair of holding members each include a plurality of guide planes each parallel to the sliding direction and a plurality of sliding contact surfaces parallel to the sliding direction. One of the pair of holding members is guided in the sliding direction by sliding the sliding contact surfaces thereof on the guide planes of the other holding member. The other holding member is guided in the sliding direction by sliding the sliding contact surfaces thereof on the guide planes of the one of the holding members. The pair of holding members are fixed to each other by a frictional force between the sliding contact surfaces and the guide planes in a state of holding the cable.
