A depth sensor and an image detecting system including the same are provided. The depth sensor includes a pixel that generates an image signal based on a sensed light. The pixel includes a first photo transistor that integrates first charges based on a first photo gate signal toggling during an integration period, a second photo transistor that integrates second charges based on a second photo gate signal toggling during the integration period, a first transfer transistor that transfers the first charges to a first floating diffusion node based on a first transfer gate signal, a second transfer transistor that transfers the second charges to a second floating diffusion node based on the first transfer gate signal, and a switch that is connected with the first photo transistor, the second photo transistor, the first transfer transistor, and the second transfer transistor.