An intake structure for a saddle-ride type vehicle for increasing the degree of freedom of the length of a duct associated with an intake air cleaner case disposed below a seat. An air taking-in port is provided in a lid member serving as a portion of an upper wall of an air cleaner case located below a seat. A concave portion is formed on an upper wall surface communicating with the taking-in port. The concave portion and a bottom plate of the seat facing the concave portion forms a pseudo duct-like intake passage communicating with the taking-in port. A side cover is provided with a stepped surface extending toward the inside of a vehicle from an external surface thereof. An opening, opened downwardly, is provided in the stepped surface to improvement in intake performance and to reduce dust and the like from entering.