Vehicle lighting device, vehicle lamp, and method of manufacturing vehicle lighting device

A vehicle lighting device comprising:

• a heat radiating portion that has a flange having a plate shape, heat radiating fins provided on one surface of the flange, and a loading portion provided on a surface of the flange on a side opposite to the side on which the heat radiating fins are provided;
• a storage portion that is provided on a side of the flange opposite to the side on which the heat radiating fins are provided, has a mounting portion surrounding a side surface of the loading portion and bayonets provided on a side surface of the mounting portion, and is formed of a material different from a material of the heat radiating portion;
• and
• a light emitting module that is provided on an end surface of the loading portion on a side opposite to the flange side and has a light emitting element,
• wherein at least one of a first concave portion and a first convex portion is provided on the side surface of the loading portion, and
• wherein at least one of a second convex portion fitted to the first concave portion and a second concave portion fitted to the first convex portion is provided on the mounting portion.