Vehicle detecting device, light distribution controlling device, and vehicle detecting method

A vehicle detecting device that:

• performs a process of detecting two luminous points corresponding to lamps of a front vehicle using a luminous point image generated from an image that is captured by an imaging device provided in a vehicle;
• and
• in accordance with a change in an angle of tilt of the vehicle's right-left axis, modifies an imaging region of the imaging device so as to mitigate a shift in the imaging region caused by the change, wherein
• the vehicle detecting device modifies at least one of a region range of the imaging region in an up-down direction of the vehicle or a region angle of the imaging region,
• when modifying the region range, the vehicle detecting device sets the region range to a first range when the angle of tilt is a first angle, and sets the region range to a second range greater than the first range when the angle of tilt is a second angle greater than the first angle, and
• when modifying the region angle, the vehicle detecting device sets the region angle to a third angle when the angle of tilt is the first angle, and sets the region angle to a fourth angle greater than the third angle when the angle of tilt is the second angle greater than the first angle.