To provide an intake device of an engine for a scooter type motorcycle capable of avoiding the increase in the width of a tunnel part due to a carburetor in the case of the engine mounted in a low-floor foot board.

This intake device is provided with a cam chain on one side in the vehicle width direction and is so structured that the carburetor 24 is connected to the external connection port 4p of an intake port 4c formed in a cylinder head of the engine 1 mounted in the low-floor foot board 144a through an intake manifold 23 or directly. In this case, the external connection port 4p of the intake port 4c is formed by deviating it from a cylinder axis a toward the cam chain side, and the carburetor 24 is positioned nearly at the center in the vehicle width direction of the tunnel part 144b of the foot board 144a.