To provide an approach angle indicating lamp such that even if its main body is vibrated, the position of an optical image in the sky is not varied.

A light source 2 is installed on a support 1. A red filter 4 is installed on the optical axis of the light source 2 via an actuator 3 made of a piezoelectric element installed on the support. The red filter 4 is mounted on transparent glass 5 serving as support. Also a lens 6 by which light passing through the filter 4 is focused high above is installed. An accelerometer 7 is installed on the potion of the support 1 near the filter 4. A controller 8 is installed which calculates displacement from the acceleration measured by the accelerometer 7, thereby displacing the actuator 3 in the opposite direction to the displacement.