To provide a connecting method and its connecting structure between a pole using clamping pieces so as to easily install fixtures in a desired position of users and a fixture installing member in the pole in which grooves extending from an upper end to an another end are formed therein.

The lower clamping piece 2a is inserted into the groove 1a while a lower clamping piece 2a connected with an loose end 1b' of one connected piece 1b is temporarily fixed by the fixture installing member 2c which is capable of installing fixtures. Then, an upper clamping piece 2b is kept in contact with the lower clamping piece 2a by inserting into a groove portion 1a, and both the connected pieces 1b are held between both clamping pieces 2a and 2b and the fixture installing member 2c.