To provide a conveyance device capable of conveying with high precision by suppressing fluctuation of thrust of a linear motor without requiring a sensor for detecting magnetic flux density and to provide an image reading device and an image forming device.

Magnetic pole interval information stored in a storage part 34 is compensated based on a position of an armature coil 2b for a fixed magnet 2a detected by an encoder and characteristic of driving electric power supplied per position.