To improve sensitivity by enhancing sensitivity of a light-receiving element and efficiently receiving a light of short wavelength of blue or purple-blue.

In a pn-type or a pin-type light-receiving element, a high-concentration one conductivity-type impurity layer and a reverse conductivity-type impurity layer are formed on a lightly-doped semiconductor substrate, the heavily-doped layer of one conductivity type is arranged on a surface of the substrate, and a light-receiving region of fixed region is formed. In the light-receiving element, a plurality of low-concentration layer exposed regions, wherein the lightly-doped layer of the semiconductor substrate is exposed on the surface of the substrate are formed in the light-receiving region. These low-concentration layer exposed regions are dispersed and arranged in the light-receiving region.

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