To enable a laser ray detecting device to be constituted of one CCD element by providing a plurality of light detecting units radially arranged and constituting a field of vision of 360°, and a CCD unit having an optical system of the same angle as the unit.

A laser ray detecting device, for example, detecting pulse laser ray 2 and discriminating the light source direction, is provided with a plurality of light detecting units 1 and one CCD unit 3. The irradiated laser ray 2 is detected by anyone of the respective light detecting units 1, and when it is discriminated as pulse laser by a specified discriminating circuit, it is output as a detected signal in response to the direction of the light detecting unit 1, and the light source direction is roughly discriminated. The laser ray 2 is also irradiated to the CCD unit 3, it is incident from an optical system according to the direction, and converged on a CCD element by a polygonal pyramid type mirror of for example 6-12 faces. By a specified method using the convergent point or the like on the CCD element, the light source direction is finely computed in the horizontal direction and the vertical direction.