Abstract: A pressure sensor includes: a diaphragm joined to a front side of a housing via a joint portion; a sensor portion; a connection portion connecting the diaphragm to the sensor portion; and a heat receiving portion disposed at the front side of the diaphragm. When: a minimum value of an area of a minimum inclusion region which is a virtual region, which include a cross-section of a portion from the heat receiving portion to the diaphragm and of which an overall length of a contour become minimum on a cross-section perpendicular to the axial line, is defined as a connection area Sn; and an area of a region surrounded by the joint portion on a projection plane perpendicular to the axial line when the diaphragm and the heat receiving portion are projected onto the projection plane is defined as a diaphragm effective area Sd, (Sn/Sd)?0.25 is satisfied.

Abstract: A saddle-riding vehicle include a body frame, an engine which is supported on the body frame, an exhaust pipe which extends rearward from a front portion of the engine 41, a fuel tank which is disposed on a side of the engine 41, a skid guard which covers the engine and the exhaust pipe from fronts thereof, and a side guard which covers a side portion of the fuel tank. The skid guard and the side guard are disposed to have an overlap portion where the skid guard and the side guard overlap partially. Therefore, the saddle-riding vehicle prevents mud or stone from entering an inside of a guard member, and prevents a fuel tank from being exposed through a gap to eliminate a deterioration of an external design of the saddle-riding vehicle.