An optical sensor of the present invention is provided with: first and second light receiving elements (20), which are disposed on a semiconductor substrate (10); a light blocking film (40), which is disposed on the semiconductor substrate (10) with a light blocking film (30) therebetween; and first and second openings (41), which are formed in the light blocking film (40), and correspond to the light receiving elements (20). Each of the first and second virtual straight lines (A-C) is defined such that the line passes the center of the first or the second opening (41a-41h) from the center of the first or the second light receiving element (20a-20h). The first virtual straight line (A-C) and the second virtual straight line (A-C) have different elevation angles and/or right-left angles.; The light receiving area of the first light receiving element (20a-20h) is larger than the opening area of the first opening (41a-41h), and the light receiving area of the second light receiving element (20a-20h) is larger than the opening area of the second opening (41a-41h).