Laser sighting device comprising a tilt detecting device

The present invention provides a laser sighting device, which comprises a tilt detecting device (33) having a liquid member (41) for forming a free liquid surface and a fixed reflection member (51) fixedly mounted, the tilt detecting device (33) being used for detecting angular deviation between the free liquid surface and the fixed reflection member (51), a main unit (2) for accommodating the tilt detecting device (33), and a laser beam irradiation unit (3) removably mounted on the main unit (2).