PURPOSE: To display good performance of cylinder distribution with a structure not complicated inexpensively further even in the case of mounting a side draft by forming a guide groove, which is for uniformly distributing adhering fuel in an internal wall of an intake path to the total periphery of the internal wall, in the intake path wall.

CONSTITUTION: An intake path P is constituted of an intake pipe 5, extended from an air cleaner 6, and a mixture body 1, interposed between the intake pipe 5 and an intake manifold 3, and an electromagnetic fuel injection valve 2 and a throttle valve 4 are arranged from the upstream side in the mixture body 1. In the mixture body 1, which is a circular cylindrical body, many parallel guide grooves 1a, which are rectangular grooves, are provided in the total periphery of an internal wall from the downstream opening end of the body 1 toward in the vicinity of the throttle valve 4. Fuel, injected by the fuel injection valve 2, almost uniformly reaches the total periphery of the internal wall of the mixture body 1, adheres without being vaporized at the time of low temperature and respectively reaches each of the nearest guide grooves 1a to flow along it as a liquid film.