PURPOSE: To reduce the number of parts and to suppress noise by a constitution wherein at least one of a plurality of insulators. supporting a pantograph on the roof of an electric rolling stock, also serves as a cable head having a terminal board and a lead-out board at the tip of the insulator.

CONSTITUTION: At least one of a plurality of insulators(not shown) for supporting a pantograph 1 on the roof 2 of an electric stock also serves as a cable head 3. The cable head 3 is provided with a terminal board 18, a lead- out board 19 and a joint metal 20 on the upper metal 17 of an insulator 5 and supports the pantograph 1. A cable 6 is inserted into the insulator 5 and a terminal rod 15 press contacting with the tip 6d thereof is inserted into an insertion hole 16 of the terminal board and fixed in place. An insulating block 8 is placed between the insulator 5 and the cable 6 at the tapered part 5a on the lower inside of the insulator 5 and secured to a base metal. 11 by means of a lower metal 9 and a screw 10. The insulator 5 has same height as those of other insulators(not shown). According to the constitution, number or parts and installation space on the roof can be reduced while furthermore noise is suppressed.