To provide an intake device for an internal combustion engine capable of suppressing cooling loss while suppressing weakening of a swirl.
The intake device includes an intake port 5 for making a tangential flow Ft flow out in the direction along the inner periphery of a cylinder 2 of the internal combustion engine by leading air toward the cylinder 2, and by using the tangential flow Ft made to flow out by the intake port 5, the swirl Fsw can be formed in the cylinder 2. The intake device is provided with a cylinder member 10 having a blade part 12A extending while twisting about the same direction as the direction of a rotational component f2 so that the tangential flow Ft includes the rotational component f2 around the axis extending in the advancing direction.
ITO HIROKAZU
Tatsuo Egami
Satoshi Nakamura
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