A support device (1) of a train line (20) is provided with a base part (91) integrally secured to a track, a guide rail (11) with which a guide ring (103) on the side of a vehicle (100) traveling on the track comes into contact, a first securing part (17) for securing the guide rail (11) to the base part (91), a second securing part (18) connected independent of the first securing part (17), a bracket (12) supported on the guide rail (11), and a train line (20) which is supported by the bracket (12) so as to be arranged in a relative position established in advance in relation to the guide rail (11), and which is slid along a power collector (104) of the vehicle (100).