Light source device and lighting device

A light source device, comprising:

• a light source including light-emitting elements, the light source including a light-emitting face being flat and formed of the light-emitting elements;
• and
• a reflector having an opening on an axis extending from the light-emitting face and perpendicularly to the light-emitting face, wherein
• the opening is located in an area inside a peripheral edge of the light-emitting face when viewed in a direction of the axis,
• light emitted from the light source passes through the opening,
• the reflector includes a reflective surface which reflects light emitted from the light source toward the light source,
• the reflective surface includes a curved surface defined by rotating one arc around the axis, the one arc being a part of an ellipse located coplanar with the axis, as the one arc being closer to the opening in the direction of the axis, the one arc being closer to the axis in a direction orthogonal to the direction of the axis,
• the ellipse including the one arc has a first focal point and a second focal point which are located on the light-emitting face,
• the second focal point is located adjacently to the one arc with respect to a center of the ellipse including the one arc, and
• a distance from the first focal point to the axis is shorter than a distance from the second focal point to the axis.