An optical fiber characteristic measurement apparatus comprising: a light source configured to output a laser beam of which frequency is modulated; an incident part configured to split the laser beam output from the light source into continuous light (L1) and pulsed light (L2), and configured to make the continuous light (L1) be incident from one end of an optical fiber (FUT) and make the pulsed light (L2) be incident from another end of the optical fiber (FUT); a light detector configured to detect light projected from the optical fiber (FUT) and output a detection signal (D1); and a detector connected to the light detector and configured to detect the scattering light based on integrated values acquired by integrating the detection signal (D1) output from the light detector for a predetermined time in a first period (T1) and a second period (T2), wherein the first period (T1) is a period during which scattering light based on the continuous light (L1) and the pulsed light (L2) is projected from the optical fiber (FUT), and wherein the second period (T2) is shorter than the first period (T1) and is a period during which the scattering light is not projected from the optical fiber (FUT), characterized in that the detector comprises: a timing adjuster configured to cut out the detection signal (D1) using the predetermined time as a unit from a plurality of different points in time in the first period (T1); and an integrator configured to individually integrate, for the predetermined time, each of detection signals (D1) which have been cut out by the timing adjuster . a light source configured to output a laser beam of which frequency is modulated; an incident part configured to split the laser beam output from the light source into continuous light (L1) and pulsed light (L2), and configured to make the continuous light (L1) be incident from one end of an optical fiber (FUT) and make the pulsed light (L2) be incident from another end of the optical fiber (FUT); a light detector configured to detect light projected from the optical fiber (FUT) and output a detection signal (D1); and a detector connected to the light detector and configured to detect the scattering light based on integrated values acquired by integrating the detection signal (D1) output from the light detector for a predetermined time in a first period (T1) and a second period (T2), wherein the first period (T1) is a period during which scattering light based on the continuous light (L1) and the pulsed light (L2) is projected from the optical fiber (FUT), and wherein the second period (T2) is shorter than the first period (T1) and is a period during which the scattering light is not projected from the optical fiber (FUT), characterized in that the detector comprises: a timing adjuster configured to cut out the detection signal (D1) using the predetermined time as a unit from a plurality of different points in time in the first period (T1); and an integrator configured to individually integrate, for the predetermined time, each of detection signals (D1) which have been cut out by the timing adjuster . a timing adjuster configured to cut out the detection signal (D1) using the predetermined time as a unit from a plurality of different points in time in the first period (T1); and an integrator configured to individually integrate, for the predetermined time, each of detection signals (D1) which have been cut out by the timing adjuster . <EOS>