Image forming apparatus and carriage

An image forming apparatus comprising:

• a carriage that has installed therein an image forming section for forming an image on a medium to be recorded and is moved to scan;
• and
• an optical sensor that is mounted on a side wall surface of the carriage in a scanning direction thereof and detects one of the medium to be recorded and a conveying surface of the medium to be recorded;
• wherein
• the side wall surface of the carriage is provided with at least two first projection parts and a second projection part that define an inclination of the optical sensor in a vertical direction thereof,
• the at least two first projection parts are arranged at a same height position with the conveying surface of the medium to be recorded as a reference, and
• the second projection part is arranged at a position higher than the first projection parts,
• the second projection part having a first part higher in position from the side wall surface of the carriage than the first projection parts and having a second part lower in position than the first part, the second part having a screw hole in which a clamping member for fixing the optical sensor is attached.