A sheet feeding apparatus includes a sheet regulation member, a lock portion, and a damper portion. The sheet regulation member is changeable between a regulation posture to regulate a sheet supported on a supporting portion not to enter a separation nip portion and a retracted posture to allow the sheet to enter the separation nip portion. The lock portion locks the sheet regulation member in the regulation posture. In a case where external force equal to or more than a predetermined amount is applied to the sheet regulation member toward the downstream in the sheet feeding direction with the sheet regulation member is locked by the lock portion in the regulation posture, the damper portion allows displacement of the sheet regulation member.