An image forming apparatus comprising an image-forming part for forming an image on paper, the image forming apparatus comprising: a resist roller pair for conveying paper toward the image-forming part; a paper feeding part accommodating a plurality of sheets of paper and having a paper feeding rotating body, the paper feeding rotating body being rotated so as to send paper out toward the resist roller pair; a detector for detecting the arrival of paper at the resist roller pair, the detector being provided upstream of the resist roller pair in the paper conveyance direction; a timer part for measuring a measurement time from when feeding of a second sheet of paper from the paper feeding part is begun to when the detector detects the arrival of the second sheet of paper, and a sheet interval time from when the detector detects the passage of a first sheet of paper immediately preceding the second sheet of paper to when the arrival of the second sheet of paper is detected; and an identifier part for referring to the measurement time and a predetermined reference measurement time acting as a reference for the measurement time, referring to the sheet interval time and a predetermined reference sheet interval time acting as a reference for the sheet interval time, deciding upon a correction to be performed upon the paper feed start timing, and delaying or advancing the paper feed start timing with respect to the current paper feed start timing for the paper feeding part on the basis of the decided-upon correction to be performed, wherein when the paper has arrived at the detector, the identifier part puts the resist roller pair into a stopped state, and once a predetermined curl generation time has passed after the detector detects the arrival of the paper, the identifier part rotates the resist roller pair, and the identifier part performs, in a case where the measurement time or average of the measurement time less the reference measurement time is a value greater than zero, and in addition the sheet interval time or average of the sheet interval time is longer than the reference interval time, correction by advancing the paper feed start timing with respect to the current paper feed start timing by an amount of time equal to the sheet interval time or average of the sheet interval time less the reference sheet interval time when the sheet interval time or average of the sheet interval time is longer than the reference sheet interval time; and not performing correction when the sheet interval time or average of the sheet interval time is equal to or less than the reference sheet interval time. a resist roller pair for conveying paper toward the image-forming part; a paper feeding part accommodating a plurality of sheets of paper and having a paper feeding rotating body, the paper feeding rotating body being rotated so as to send paper out toward the resist roller pair; a detector for detecting the arrival of paper at the resist roller pair, the detector being provided upstream of the resist roller pair in the paper conveyance direction; a timer part for measuring a measurement time from when feeding of a second sheet of paper from the paper feeding part is begun to when the detector detects the arrival of the second sheet of paper, and a sheet interval time from when the detector detects the passage of a first sheet of paper immediately preceding the second sheet of paper to when the arrival of the second sheet of paper is detected; and an identifier part for referring to the measurement time and a predetermined reference measurement time acting as a reference for the measurement time, referring to the sheet interval time and a predetermined reference sheet interval time acting as a reference for the sheet interval time, deciding upon a correction to be performed upon the paper feed start timing, and delaying or advancing the paper feed start timing with respect to the current paper feed start timing for the paper feeding part on the basis of the decided-upon correction to be performed, wherein when the paper has arrived at the detector, the identifier part puts the resist roller pair into a stopped state, and once a predetermined curl generation time has passed after the detector detects the arrival of the paper, the identifier part rotates the resist roller pair, and the identifier part performs, in a case where the measurement time or average of the measurement time less the reference measurement time is a value greater than zero, and in addition the sheet interval time or average of the sheet interval time is longer than the reference interval time, correction by advancing the paper feed start timing with respect to the current paper feed start timing by an amount of time equal to the sheet interval time or average of the sheet interval time less the reference sheet interval time when the sheet interval time or average of the sheet interval time is longer than the reference sheet interval time; and not performing correction when the sheet interval time or average of the sheet interval time is equal to or less than the reference sheet interval time.