An intake device for an engine

The present invention provides an engine air intake device. The intake device does not interfere with the intake air can be improved by the way lead to the reverse-flow lubricating oil adheres to the filter. An intake device for an engine according to the present invention (1) has a carburetor portion (2) and the air filter portion (4), the carburetor portion (2) having: a body (5), to the air filter comprising having an intake passage (6) opening (6a) of the cleaning portion (4); and a choke valve (8); choke valve (8) is a plate-shaped valve body (8b) of the butterfly valve. The air cleaner unit (4) having: an air filter (12); breather chamber (14), which is provided on the air filter (12) and the intake passage (6) between; and the reverse-flow preventing surface ( 18b), which is provided in the breather chamber (14). The air cleaner unit (4) further having a plate-like partition portion (24), the partition portion (24) with the choke valve (8) in the valve body (8b) at the side of the fully opened air cleaner around (8c) extending in a continuous manner from the vicinity of (8c) to the peripheral surface of the reverse-flow restriction (18b) nearby.