Optical scanning apparatus and image forming apparatus

An optical scanning apparatus comprising:

• a light source configured to emit a beam in accordance with image information;
• a controller substrate configured to control said light source;
• a deflector configured to scanningly deflect the beam emitted by said light source;
• an optical system configured to direct the beam deflected by said deflector onto a member-to-be-scanned;
• a casing supporting said controller substrate, said deflector and said optical system,
• wherein said controller substrate is provided with a projected portion projecting relative to said casing;
• and
• a connector configured to removably connect a cable for supplying a signal to said light source, said connector being provided on a surface of said projected portion where said controller substrate is supported by said casing,
• wherein said cable is insertable and removable relative to said connector in a direction parallel with the surface of said projected portion provided with said connector.