A side cover structure for straddle type vehicle for preventing heat at a part of the vehicle such as a knee grip portion, where the passenger's legs touch. An engine is supported on the vehicle body frame with a passenger seat disposed above the engine. A side cover covers the side direction of the vehicle body. The side cover has a knee grip portion at the position where the passenger's legs touch in the front direction of a passenger seat. In addition, the knee grip portion is doubly configured inside and outside.