Vehicle lighting device and vehicle lamp

A vehicle lighting device comprising:

• a mounting portion that has a recessed portion;
• a plurality of bayonets that are provided on an outside surface of the mounting portion for attaching the vehicle lighting device with a housing of a vehicle lamp;
• a substrate that is provided on a bottom surface of the recessed portion;
• and
• a light emitting element that is provided on a side of the substrate opposite to a bottom surface side of the recessed portion,
• in a case where the vehicle lighting device is viewed from a light emitting side, each of a plurality of aligned corner portion of the substrate overlaps one of the plurality of bayonets, and at least a part of each of the plurality of aligned corner portions of the substrate is provided on an outside of the outside surface of the mounting portion.