Patent ID: 8438931

Claim:
A semiconductor strain sensor comprising: a semiconductor strain sensor chip comprised of a semiconductor substrate including a piezoresistive element formed on an upper surface thereof; a metal base plate having a bonding area to which an undersurface of the semiconductor strain sensor chip is bonded, the metal base plate including at least two extending members, which protrude from sides of the bonding area and have connection areas on undersurfaces of the metal base plate for attaching the strain sensor chip to a surface of an object to be measured; wherein said metal base plate and said extending members are unified and include a pair of first grooves on the undersurface thereof located, respectively, at opposite ends of said bonding area, said first grooves extending perpendicularly to a strain direction over the entire width of said metal base plate, and wherein said first grooves are configured to prevent said bonding area, through which said strain sensor chip is bonded to said metal base plate, from being bent when said object to be measured is bent in an XY plane, and a wiring member connected to an electrode of the piezoresistive element of the strain sensor chip being drawn outward.