Vehicle interior lamp

1. A vehicle interior lamp comprising:

a light source that is a semiconductor-type light source having light directionality, the light source having a unit structure including a main body, a light-radiating unit that is provided in the main body to radiate light, and a heat sink member that is provided in the main body;

a lamp housing having a heat-discharge opening arranged at a position corresponding to the light source;

a lamp lens; and

a lamp chamber delimited by the lamp housing and the lamp lens, wherein

the lamp housing has a heat-guiding path arranged in a predetermined direction from a portion of an edge of the heat-discharge opening.

2. The vehicle interior lamp according to claim 1 , further comprising

a heat guiding protrusion arranged along an edge of the heat-discharge opening and an edge of the heat-guiding path.

3. The vehicle interior lamp according to claim 1 , wherein

the heat sink member of the light source has a fin-like shape, and

the light source is arranged in the lamp chamber in an inclined state relative to an attachment surface of the lamp housing so that a longitudinal direction of a fin of the heat sink member is inclined in a direction from inside the lamp chamber to the heat-discharge opening.

4. The vehicle interior lamp according to claim 1 , wherein

the light source is electrically connected to a side of a power supply by a harness, and

the harness is arranged from inside the lamp chamber to an outside of the lamp chamber via the heat-discharge opening.

5. The vehicle interior lamp according to claim 1 , wherein

the lamp housing has a step arranged one level downward at a portion of the edge of the heat-discharge opening, and

the step forms a wiring path where the harness is arranged.

6. The vehicle interior lamp according to claim 5 , wherein the step has a fixing unit arranged in the wiring path to secure the harness.