Patent ID: 8456648

Claim:
An optical detection device comprising: an irradiation unit that emits irradiation light; first and second light receiving units that receive reflection light of the irradiation light reflected by a target object; and a calculation unit that calculates positional information of the target object based on a light reception result of at least one of the first and second light receiving units, wherein the first and second light receiving units receive the reflection light that is incident in a direction along a planar area, wherein a distance between the second light receiving unit and the planar area is shorter than a distance between the first light receiving unit and the planar area, wherein the irradiation unit includes a first light source section that forms a first irradiation light intensity distribution in a light intensity distribution forming area and a second light source section that forms a second irradiation light intensity distribution, of which an intensity distribution is different from that of the first irradiation light intensity distribution, in the light intensity distribution forming area, and wherein the first irradiation light intensity distribution is an intensity distribution in which an intensity of the irradiation light decreases from one end side of the light intensity distribution forming area toward the other end side, and the second irradiation light intensity distribution is an intensity distribution in which an intensity of the irradiation light decreases from the other side of the light intensity distribution forming area toward the one end side.