A laser scanning system comprising: a first rotation mechanism configured to perform a rotation in a predetermined first rotation axis and at a rotation speed around the first rotation axis as a rotation center; a first rotation speed control unit configured to control the rotation speed of the rotation in the first rotation axis by the first rotation mechanism; and a laser scanner device disposed on the first rotation mechanism, to be rotated together with and by the first rotation mechanism, and the laser scanner device including a laser distance measuring unit configured to emit a laser and to measure a distance to a detection target, wherein the first rotation speed control unit is configured to make a control to the rotation speed of the rotation in the first rotation axis in a detection rotation angle range corresponding to an area in which the detection target is present and another control to the rotation speed of the rotation in the first rotation axis in a non-detection rotation angle range corresponding to another area in which the detection target is not present, wherein the first rotation speed control unit is configured to make the first rotation axis rotation speed in the detection rotation angle range lower than the first rotation axis rotation speed in the non-detection rotation angle range, characterized in that the laser scanning system comprises at least a second laser scanner device disposed on the first rotation mechanism, to be rotated together with and by the first rotation mechanism, wherein the first rotation speed control unit is configured to rotate the first rotation mechanism such that the rotation angles of the laser scanner device and the at least second laser scanner device emitting laser pulses in a revolution are not the same rotation angles in one turn of each of the laser scanner devices, and wherein each one of the laser scanner device and at least second laser scanner device includes a second rotation mechanism configured to rotate the respective laser distance measuring unit at a second rotation axis rotation speed around a second rotation axis which is defined to be a straight axis which has a predetermined angle with respect to the first rotation axis, wherein the laser distance measuring unit of each one of the laser scanner device and at least second laser scanner device is configured to emit a laser in a predetermined angular direction with respect to the second rotation axis, wherein a two dimensional plane in which a circle is formed by rotating a radiation direction of the laser pulses about the second rotation axis is tilted in respect of the first rotation axis. a first rotation mechanism configured to perform a rotation in a predetermined first rotation axis and at a rotation speed around the first rotation axis as a rotation center; a first rotation speed control unit configured to control the rotation speed of the rotation in the first rotation axis by the first rotation mechanism; and a laser scanner device disposed on the first rotation mechanism, to be rotated together with and by the first rotation mechanism, and the laser scanner device including a laser distance measuring unit configured to emit a laser and to measure a distance to a detection target, wherein the first rotation speed control unit is configured to make a control to the rotation speed of the rotation in the first rotation axis in a detection rotation angle range corresponding to an area in which the detection target is present and another control to the rotation speed of the rotation in the first rotation axis in a non-detection rotation angle range corresponding to another area in which the detection target is not present, wherein the first rotation speed control unit is configured to make the first rotation axis rotation speed in the detection rotation angle range lower than the first rotation axis rotation speed in the non-detection rotation angle range, characterized in that the laser scanning system comprises at least a second laser scanner device disposed on the first rotation mechanism, to be rotated together with and by the first rotation mechanism, wherein the first rotation speed control unit is configured to rotate the first rotation mechanism such that the rotation angles of the laser scanner device and the at least second laser scanner device emitting laser pulses in a revolution are not the same rotation angles in one turn of each of the laser scanner devices, and wherein each one of the laser scanner device and at least second laser scanner device includes a second rotation mechanism configured to rotate the respective laser distance measuring unit at a second rotation axis rotation speed around a second rotation axis which is defined to be a straight axis which has a predetermined angle with respect to the first rotation axis, wherein the laser distance measuring unit of each one of the laser scanner device and at least second laser scanner device is configured to emit a laser in a predetermined angular direction with respect to the second rotation axis, wherein a two dimensional plane in which a circle is formed by rotating a radiation direction of the laser pulses about the second rotation axis is tilted in respect of the first rotation axis.