To improve durability by improving wear resistance, in a carburetor wherein a sliding valve made of aluminium material is fitted to a carburetor main body having an intake passage and cast and molded from the aluminium material so as to slide across the intake passage.

On either one of an inner surface of a sliding hole 6 provided on the carburetor main body 2 so as to be fitted with the sliding valve 7 or an outer surface of the sliding valve 7, a diamond-like carbon layer 33 is formed.