A distance measuring apparatus, which can achieve reduction in cost and size and perform measurement ranging from short-distance to long-distance accurately, includes an unit outputting first pulsed light L1 to a measurement object, an unit detecting first pulsed light L2 reflected by the measurement object to output a signal responsive to an intensity variation thereof, a measuring unit measuring a time difference between output and detection of the first pulsed light during a period when an intensity of the signal is larger than a predetermined value, a measuring unit measuring the time difference at a time when an intensity of the signal varies from less than a predetermined value to the predetermined value or more, and an unit calculating a distance to the measurement object using a time difference measured by at least one of the two measuring units.