A measurement monitoring device mounted on a measuring vehicle having a laser scanner mounted thereon, wherein - the laser scanner is configured to repeatedly perform a laser measurement for acquiring laser measurement data, - the laser measurement data indicates a measurement distance for each irradiation angle of laser light, and - the measurement monitoring device comprises: - - an acquisition unit configured to acquire the laser measurement data every time the laser measurement is performed; - - a first detection unit configured to detect an attention angle, which is an irradiation angle corresponding to a measurement distance not included in a standard distance range, based on the acquired laser measurement data, wherein the standard distance range is a predetermined range of distances from the laser scanner to a road surface for each irradiation angle, and wherein the first detection unit acquires a measurement time from the acquired laser measurement data; - - a second detection unit configured to detect a warning angle, which is an irradiation angle matching the attention angle for a time longer than an allowable time; and - - a warning unit configured to issue a warning when the warning angle is detected. - the laser scanner is configured to repeatedly perform a laser measurement for acquiring laser measurement data, - the laser measurement data indicates a measurement distance for each irradiation angle of laser light, and - the measurement monitoring device comprises: - - an acquisition unit configured to acquire the laser measurement data every time the laser measurement is performed; - - a first detection unit configured to detect an attention angle, which is an irradiation angle corresponding to a measurement distance not included in a standard distance range, based on the acquired laser measurement data, wherein the standard distance range is a predetermined range of distances from the laser scanner to a road surface for each irradiation angle, and wherein the first detection unit acquires a measurement time from the acquired laser measurement data; - - a second detection unit configured to detect a warning angle, which is an irradiation angle matching the attention angle for a time longer than an allowable time; and - - a warning unit configured to issue a warning when the warning angle is detected. - - an acquisition unit configured to acquire the laser measurement data every time the laser measurement is performed; - - a first detection unit configured to detect an attention angle, which is an irradiation angle corresponding to a measurement distance not included in a standard distance range, based on the acquired laser measurement data, wherein the standard distance range is a predetermined range of distances from the laser scanner to a road surface for each irradiation angle, and wherein the first detection unit acquires a measurement time from the acquired laser measurement data; - - a second detection unit configured to detect a warning angle, which is an irradiation angle matching the attention angle for a time longer than an allowable time; and - - a warning unit configured to issue a warning when the warning angle is detected. <EOS>