An object of the paper sheet feed mechanism of the present invention is to provide a paper sheet feed mechanism in which delivery of paper sheets is stable. The paper sheet feed mechanism comprises a feed roller conveying paper money to the right direction of the drawing, a spring pressing the feed roller against the paper money, a sensor detecting the press force that the paper money receives by being pressed by the feed roller, a push-up board pushing up the paper money, and a control section regulating the height of the push-up board based on the detection result by the sensor, and also comprises a pick roller conveying the paper sheet at a conveyance speed faster than a conveyance speed by the feed roller.