To provide a light distribution control device enabling a driver to easily find a route change point guided by a navigating device.

A navigation processing portion 11 searches a traveling route to a destination, and determines a route change point such as a junction point of an intersection from the traveling route and a detected vehicular present position. When the vehicle achieves a specified distance M in the upstream side from the route change point, a head lamp device is controlled to irradiate a guiding direction at the junction point. When irradiating the guiding direction, controlling is conducted by a mode selected by a user from a first mode expanding an irradiating range in a route change direction in addition to an normal irradiating range, a second mode executing the first mode at a dark place without a streetlamp, and a third mode changing an irradiating direction in the route change direction. If the user does not select the mode, the first mode is selected as a default value.