A distance measuring apparatus for measuring a distance L to a distance measurement object based on a time T 0 from projection of an irradiating light onto the distance measurement object until reception of a reflected light from the distance measurement object, the distance measuring apparatus comprising: a light projecting unit configured to project the irradiating light onto the distance measurement object at predetermined time intervals based on a trigger signal output by a driving trigger unit comprised in a distance measuring unit; a first light receiving unit configured to receive the reflected light and convert the reflected light into a received light signal based on the reflected light; a second light receiving unit disposed adjacent to the light projecting unit, the second light receiving unit being configured to receive the irradiating light and convert the irradiating light into a reference signal based on the irradiating light, the second light receiving unit being different from the first light receiving unit; characterized in that the distance measuring apparatus further includes a distance operation unit comprised in the distance measuring unit, the distance operation unit being configured to obtain a time T 0 from projection of the irradiating light onto the distance measurement object by the light projecting unit until reception of the reflected light by the first light receiving unit from a measured time difference T 1 and a known correction value ΔT measured in advance, an integration operation unit comprised in the distance measuring unit, the integration operation unit being configured to calculate an integrated waveform based on a reference waveform of the reference signal and a waveform of the received light signal in response to a trigger signal from the driving trigger unit, and to determine, based on the integrated waveform, the measured time difference (T 1) corresponding to a time from an output of the trigger signal until a peak value of the integrated waveform, wherein the distance operation unit is configured to calculate the distance L to the distance measurement object based on the obtained time T 0 and the velocity of light c according to Formula. L = c ⋅ T 0 2 = c ⋅ T 1 + Δ T 2 a light projecting unit configured to project the irradiating light onto the distance measurement object at predetermined time intervals based on a trigger signal output by a driving trigger unit comprised in a distance measuring unit; a first light receiving unit configured to receive the reflected light and convert the reflected light into a received light signal based on the reflected light; a second light receiving unit disposed adjacent to the light projecting unit, the second light receiving unit being configured to receive the irradiating light and convert the irradiating light into a reference signal based on the irradiating light, the second light receiving unit being different from the first light receiving unit; characterized in that the distance measuring apparatus further includes a distance operation unit comprised in the distance measuring unit, the distance operation unit being configured to obtain a time T 0 from projection of the irradiating light onto the distance measurement object by the light projecting unit until reception of the reflected light by the first light receiving unit from a measured time difference T 1 and a known correction value ΔT measured in advance, an integration operation unit comprised in the distance measuring unit, the integration operation unit being configured to calculate an integrated waveform based on a reference waveform of the reference signal and a waveform of the received light signal in response to a trigger signal from the driving trigger unit, and to determine, based on the integrated waveform, the measured time difference (T 1) corresponding to a time from an output of the trigger signal until a peak value of the integrated waveform, wherein the distance operation unit is configured to calculate the distance L to the distance measurement object based on the obtained time T 0 and the velocity of light c according to Formula. L = c ⋅ T 0 2 = c ⋅ T 1 + Δ T 2