Patent ID: 8188556

Claim:
A semiconductor sensor comprising: a first semiconductor layer as a base; an insulating layer formed on the first semiconductor layer; and a second semiconductor layer formed on the insulating layer, wherein a recess is formed from a bottom surface of the first semiconductor layer up to a top surface of the insulating layer, the second semiconductor layer is covered with the insulating layer in an outer circumference of a top surface of the recess, and a sensitive region of the second semiconductor layer is exposed in a region except the outer circumference of the top surface of the recess, and wherein in the insulating layer covering the second semiconductor layer in the outer circumference of the top surface of the recess, a reinforcement film thickness of the insulating layer becomes thinner from an outer circumference side of the sensitive region toward a center of the sensitive region, wherein a surface of the reinforcement film is shaped as a concave arc.