Image reading device, image forming apparatus, and image reading method

An image reading device that performs photoelectric conversion on reflected light from a document to read the document, the image reading device comprising:

• a moving body configured to move to convey at least one of a light source that irradiates the document, a reflecting member that reflects the reflected light, and a photoelectric conversion element that performs photoelectric conversion on the reflected light;
• a driver configured to drive the moving body such that the moving body moves back and forth from a stop position to a target stop position in a sub-scanning direction;
• a detector positioned away from the target stop position by a distance in the sub-scanning direction, the detector configured to detect an arrival of the moving body;
• and
• a controller configured to control the driver such that the driver is switched from a state of being driven in a synchronizing operation region to a state of being driven in a self-starting region before the detector detects the arrival of the moving body, to move the moving body.