Illumination device and image scanner

An illumination device comprising:

• a plurality of light sources;
• and
• a light guide member formed of a transparent material and having a rodlike shape, the light guide member being configured to propagate light entering inside thereof while reflecting the light, wherein:
• the light guide member includes:
• an incidence part that has an incidence surface to allow light emitted from the plurality of light sources to enter and to guide the entered light towards a center of the light guide member in a major axis direction thereof, and
• a central part that has a scattering surface to emit the light guided from the incidence part towards an illumination target body,
• the plurality of light sources include:
• a first light source that has a light emission surface facing the incidence surface, and
• a second light source that has a light emission surface facing the incidence surface and is arranged on a side of the central part relative to the first light source, in a same cross-sectional view, the incidence part has:
• a first curved surface that is placed facing the incidence surface, is arranged on the side of the central part relative to the first curved surface and reflects the light entering through the incidence surface towards the central part,
• the second light source is arranged on a central side of the light guide member relative to an end point of the second curved surface on a side of an end part of the light guide member in a cross section at a plane orthogonal to the incidence surface and parallel to the major axis direction, and
• a first edge part of the first curved surface and a second edge part as the end part of the second curved surface are joined at a discontinuity point in the cross section, and the first and second edge parts project towards the incidence surface of the incidence part.