A sheet feed apparatus comprising: a casing; a sheet stacking portion provided in the casing, in which sheets are stacked; a sheet conveying path through which the sheets stacked in the sheet stacking portion are conveyed in a predetermined sheet conveying direction; a sheet feed roller provided in the casing so as to face a downstream side of the sheet stacking portion in the sheet conveying direction, and configured to convey the sheets in the sheet conveying direction; a separation pad provided facing the sheet feed roller, and configured to form, with the sheet feed roller, a nip portion through which the sheets pass, and convey the sheets one by one in the sheet conveying direction; a holder configured to fix and support the separation pad; a mount portion provided in the downstream side from the sheet stacking portion in the sheet conveying direction in the casing, to and from which the holder is mountable and removable; and an urging member configured to urge the separation pad toward the sheet feed roller via the holder being in a mounted state where the holder is mounted to the mount portion, wherein the holder is configured to be changeable in its posture between a first posture and a second posture, the first posture being a posture in which the separation pad is spaced apart from the sheet feed roller so as to release the nip portion while the holder is in the mounted state, and the second posture being a posture in which the nip portion is formed between the separation pad and the sheet feed roller while the holder is in the mounted state, and the holder includes a contact part that contacts the mount portion when the holder is in the second posture, the mount portion includes an inner wall which defines a mount space in which the holder is mounted, and faces the holder in a sheet width direction intersecting the sheet conveying direction, characterized in that when the holder is in the second posture, the contact part comes into contact with the inner wall toward the sheet width direction. a casing; a sheet stacking portion provided in the casing, in which sheets are stacked; a sheet conveying path through which the sheets stacked in the sheet stacking portion are conveyed in a predetermined sheet conveying direction; a sheet feed roller provided in the casing so as to face a downstream side of the sheet stacking portion in the sheet conveying direction, and configured to convey the sheets in the sheet conveying direction; a separation pad provided facing the sheet feed roller, and configured to form, with the sheet feed roller, a nip portion through which the sheets pass, and convey the sheets one by one in the sheet conveying direction; a holder configured to fix and support the separation pad; a mount portion provided in the downstream side from the sheet stacking portion in the sheet conveying direction in the casing, to and from which the holder is mountable and removable; and an urging member configured to urge the separation pad toward the sheet feed roller via the holder being in a mounted state where the holder is mounted to the mount portion, wherein the holder is configured to be changeable in its posture between a first posture and a second posture, the first posture being a posture in which the separation pad is spaced apart from the sheet feed roller so as to release the nip portion while the holder is in the mounted state, and the second posture being a posture in which the nip portion is formed between the separation pad and the sheet feed roller while the holder is in the mounted state, and the holder includes a contact part that contacts the mount portion when the holder is in the second posture, the mount portion includes an inner wall which defines a mount space in which the holder is mounted, and faces the holder in a sheet width direction intersecting the sheet conveying direction, characterized in that when the holder is in the second posture, the contact part comes into contact with the inner wall toward the sheet width direction.