If you go along Roppongi Street from the Roppongi intersection, you will find the 3rd entrance of the Hibiya Line and the Oedo Line on your left.

From this 3rd entrance to the 1a entrance in front of Roppongi Hills, you will go back and forth above ground, and from 1a, you will use the underground connection passage to Roppongi Hills again.

If you go down the 3rd entrance and continue through the underground connecting passage in the direction of Roppongi Station, you can go to the ticket gate of the Hibiya Line.

Pass in front of the ticket gate of the Hibiya Line, and go to the ticket gate of the Oedo Line, and even to Tokyo Midtown.