A vehicle headlight for mounting on a vehicle, comprising: a light emitting unit configured to emit light of a changeable light distribution pattern (200, 300) toward another vehicle located in front of the vehicle; a determination unit configured to determine information from a detection device that detects the other vehicle and generates a signal indicating a turn sign of the other vehicle; and a control unit configured to receive a signal indicating the other vehicle detected by the detection device and a signal indicating a turn sign of the other vehicle, and wherein the control unit is configured to control J the light emitting unit such that, when the signal indicating the other vehicle is input, a region including at least a first region (211, 311) overlapping with an entire visual recognition portion for allowing a driver of the other vehicle to visually recognize the outside of the vehicle in the light distribution pattern (200, 300) becomes a light reduction region (210, 310) in which a total light flux amount of light from the light emitting unit decreases as compared with that before the signal indicating the other vehicle is input, and to control the light emitting unit such that, when the signal indicating a turn sign of the other vehicle is further input in addition to the signal indicating the other vehicle, at least the first region (211, 311) in the light reduction region (210, 310) expands to a turning direction side indicated by the turn sign as compared with that after the signal indicating the other vehicle is input and before the signal indicating the turn sign of the other vehicle is input, and wherein the light reduction region (210, 310) includes a third region connected to an upper edge of the first region, and characterized in that: the control unit is configured to control the light emitting unit such that an edge of the third region on the turning direction side is located closer to the other vehicle than an edge of the first region on the turning direction side when the signal indicating the turn sign of the other vehicle is further input in addition to the signal indicating the other vehicle. a light emitting unit configured to emit light of a changeable light distribution pattern (200, 300) toward another vehicle located in front of the vehicle; a determination unit configured to determine information from a detection device that detects the other vehicle and generates a signal indicating a turn sign of the other vehicle; and a control unit configured to receive a signal indicating the other vehicle detected by the detection device and a signal indicating a turn sign of the other vehicle, and wherein the control unit is configured to control J the light emitting unit such that, when the signal indicating the other vehicle is input, a region including at least a first region (211, 311) overlapping with an entire visual recognition portion for allowing a driver of the other vehicle to visually recognize the outside of the vehicle in the light distribution pattern (200, 300) becomes a light reduction region (210, 310) in which a total light flux amount of light from the light emitting unit decreases as compared with that before the signal indicating the other vehicle is input, and to control the light emitting unit such that, when the signal indicating a turn sign of the other vehicle is further input in addition to the signal indicating the other vehicle, at least the first region (211, 311) in the light reduction region (210, 310) expands to a turning direction side indicated by the turn sign as compared with that after the signal indicating the other vehicle is input and before the signal indicating the turn sign of the other vehicle is input, and wherein the light reduction region (210, 310) includes a third region connected to an upper edge of the first region, and characterized in that: the control unit is configured to control the light emitting unit such that an edge of the third region on the turning direction side is located closer to the other vehicle than an edge of the first region on the turning direction side when the signal indicating the turn sign of the other vehicle is further input in addition to the signal indicating the other vehicle.