A lighting apparatus with a linear light source is provided. The lighting apparatus includes a light source extending in a longitudinal direction and having terminal parts on both ends of the light source to be connected to a power supply; a spacer having an internal space that is opened in a front-rear direction and accommodates the light source, wherein mounting parts formed on both ends of the internal space to provide the terminal parts; and a reflective bracket mounted on a rear end of the spacer to cover the internal space, and having fixing parts that match the mounting parts to fix the terminal parts when the reflective bracket is mounted on the spacer, wherein an inner surface of the reflective bracket is configured to reflect light emitted from the light source.