To provide an identification information reader, a bill reader, and an image forming apparatus, capable of preventing the misreading of identification information, without fail.

An identification information acquisition device, a bill reader, and an image forming apparatus are installed on a conveyance path R for conveying a member to be read, such as a bill S, including identification information which can be read as magnetic information and is provided with a magnetic head 10 as a reading means for reading the identification information, as magnetic information, in a prescribed tilted state.