Abstract: A laser device for guiding a missile to a target such as an enemy tank, includes a laser transmitter (1) which transmits radiation (2) which is received by a modulator (30) capable of delivering two distinct pulsed beams (51, 52) in response thereto. The first beam (51) is directed to a missile (7) to measure the angle and the distance of the missile and to convey piloting instructions thereto by modulation of said pulses, and the second beam (52) is directed towards a target (55) by a reflector (54) mounted on an aiming sight (22) in order to measure the distance to the target. The device further includes a computer (28) for determining the trajectory to be followed by the missile towards the target on the basis of the distances to the missile and to the target and on the basis of the angle between said distances.