Air intake device held between directly connected air cleaner case and intake manifold

In an air intake device, a throttle body (3) is sandwiched between an air cleaner case (63) and an intake manifold (7) which are connected in direct contact with each other. A gasket (9) for preventing an air leakage is provided between the air cleaner case (63) and the intake manifold (7) radially outside the throttle body (3). Alternatively, crushable thin projections (3b) are provided on the top and the bottom surfaces of the flange (3a). When the flange (3a) is sandwiched between the case (63) and the intake manifold (7), the thin projections (3b) are crushed to provide seals therebetween.