An intake structure for a saddle type vehicle for effectively lower the temperature of suction air includes an intake system disposed behind an engine supported on a vehicle body frame and a vehicle body cover for covering at least a side of the intake system. An inlet that is open to a side of a vehicle body on the inner side of the vehicle body cover is provided in the intake system. Further, a negative pressure formation section is provided at a position of the vehicle body cover at a substantially equal height to that of the inlet and on the rear side of the vehicle. The negative pressure formation section is configured from a depressed portion at which a vehicle body cover surface is depressed to the inner side of the vehicle body and an opening positioned in the depressed portion.