An optical distance measuring device using light includes a light-emitting part in which a first and second light-emitting elements that have a light-emitting region, in which a length in a first direction is longer than that in a second direction intersecting the first direction, are separated from each other in the second direction; two projection lenses that are respectively provided to correspond to the first and second light-emitting elements, and are separated from each other in the second direction and arranged at positions overlapping each other in the first direction; a scanner that scans a measurement region with emitted beams emitted from the light-emitting part and have passed through the projection lenses; a light receiving part that receives reflected light of the emitted beams emitted from the light-emitting part; and a measurement section measuring a distance to an object according to a time period from light emission to light reception.