Image scanning device

An image scanning device comprising:

• a linear light source to illuminate a linear illumination position of a scan target with light;
• a lens body to focus the light from the scan target;
• and
• a sensor to receive the light focused by the lens body,
• the linear light source including
• a light guide being a rod-like transparent body extending along a main scan direction of the sensor and configured to guide, in the main scan direction, light entering the light guide through an end surface of the transparent body,
• a scatterer configured to scatter light and formed along the main scan direction on a surface of the light guide that is opposite to an illumination position side of the light guide,
• an emitter formed along the main scan direction on a surface of the light guide between the scatterer and the illumination position and configured to emit the light scattered by the scatterer to the illumination position,
• a stepped portion formed, from the end surface of the transparent body along the main scan direction, on a side of the light guide that is opposite to the illumination position side of the light guide, the stepped portion inclining relative to the main scan direction, and
• a light-shielding member covering a portion of the emitter of the light guide, the portion including the end surface of the transparent body, the light-shielding member extending beyond the stepped portion in the main scan direction and having an end portion that is located out of a scan range of the sensor in the main scan direction.