Vehicle lighting device

A vehicle lighting device comprising:

• a light emitting element that is arranged in vicinity of a predetermined point on an optical axis extending in forward and backward directions of the lighting device and that directs in a forward direction of the lighting device;
• and
• a light transmitting member arranged on a front side of the lighting device relative to the light emitting element,
• wherein light emitted from the light emitting element enters the light transmitting member, the light entered the light transmitting member is reflected by an internal reflection on a front surface of the light transmitting member, the light reflected on the front surface of the light transmitting member is reflected by an internal reflection on a rear surface of the light transmitting member, and the light reflected on the rear surface of the light transmitting member exits the front surface of the light transmitting member,
• wherein the front surface of the light transmitting member comprises a planar surface perpendicular to the optical axis,
• wherein the rear surface of the light transmitting member is composed of a predetermined light reflection controlling surface formed by adopting, as a reference surface, a paraboloid of revolution having a focal point at a position of plane symmetry with the predetermined point with respect to the front surface of the light transmitting member,
• wherein an annular region having a center at the optical axis in the front surface of the light transmitting member is mirror-finished,
• wherein an outer peripheral edge of the annular region is positioned in a vicinity of a position where an incident angle of the light exited the light emitting element and reached the front surface of the light transmitting member is equal to a critical angle, and
• wherein an inner peripheral edge of the annular region is set in a vicinity of a position where the light having exited the light emitting element and reflected by the internal reflection on the front surface of the light transmitting member enters a position immediately behind the outer peripheral edge of the annular region in the rear surface of the light transmitting member.