To provide a recording medium feeder comprising an overloading prevention means capable of preventing an excessive stack of the recording mediums of various sizes without fail, even with its simple and inexpensive configuration.

In the recording medium feeder that is a storing section loading a plurality of the recording mediums and includes the storing section comprised in a drawer type relative to the body of the recording medium feeder, a stopper mechanism displaced by abutting on the uppermost surface of the stored recording medium is provided when the recording medium stored in the storing section is excessively stacked, and a displacement position displacing the stopper mechanism can be resolved by the recording medium feeder having an attachment restricted position that can not be attached the storing section to the body of the recording medium feeder.