To provide a telescopic terminal easy in installation and further compact in size.

The L-shaped telescopic terminal comprises a thunder-receiving part 10 for the telescopic terminal having a lip groove shape cross section on the surface of which a preset temperature 13 and an installation position 12 corresponding to the preset temperature 13 are indicated, a joint 20 that connects the thunder-receiving part 10 for the telescopic terminal and an aluminum thunder-receiving part 100, and a cylindrical L-shaped case 30 in which the thunder-receiving part 10 for the telescopic terminal connected to the joint 20 at its both ends is inserted and held. Firstly, the temperature of the installation position is calculated, the installation position 12 to the L-shaped telescopic terminal of the thunder-receiving part 10 for the telescopic terminal is determined according to the result of the calculation, and the thunder-receiving part 10 for the telescopic terminal is accommodated in the L-shaped case 30 so that the end of the L-shaped case 30 corresponds to the installation position 12.