Optical distance measuring sensor and self-propelled cleaner

An optical distance measuring sensor, comprising:

• a plurality of light-emitting elements that emit light;
• one lens that transmits light emitted from the plurality of light-emitting elements;
• a photodetector having a light-receiving surface on which light passed through the lens and reflected on an object to be detected is incident, the photodetector outputting a signal corresponding to a position of the incident light in the light-receiving surface;
• a light emission driving part that drives the plurality of light-emitting elements;
• a distance signal outputting part that receives a signal from the photodetector and outputs distance signal representing a distance to the object to be detected;
• a timing signal outputting part that outputs a timing signal having a prescribed cycle to activate a selected one of the plurality of light-emitting elements at a prescribed cycle;
• an initialization signal outputting part that outputs an initialization signal to the timing signal outputting part at a timing for switching the light emission among the light-emitting elements, such that the timing signal outputting part activates another selected one of the plurality of light-emitting elements at the prescribed cycle.