A sheet supplying apparatus , comprising: a loading table configured to accommodate one or more sheets of a printing medium (P); a pickup member configured to pick up a sheet from the loading table ; an alignment member pivotable to an alignment location for blocking and aligning fore-ends of a sheet on the loading table , and to a transport-allowing location for allowing a sheet picked up by the pickup member to be transported; a cam gear comprising a gear portion partially including a tooth-omitted portion , and a cam portion configured to switch the alignment member between the alignment location and the transport-allowing location at first and second rotating locations of the cam gear ; a main gear ; a swing arm pivotable about a same axis as a rotation axis of the main gear ; and first and second swing gears supported by the swing arm to interlock with the main gear , configured to selectively interlock with the gear portion according to a rotating direction of the main gear , and to rotate the cam gear to the first and second rotating locations; characterized by comprising: a holder configured to support the pickup member and be pivotable to a pickup location for allowing the pickup member to contact the sheet on the loading table , and a separating location for spacing the pickup member apart from the sheet on the loading table ; and a first elastic member configured to apply to the holder an elastic force in a direction allowing the holder to be pivoted to the pickup location, wherein the alignment member is configured to apply a force to the holder such that the holder is pivoted to the separating location, when the alignment member is switched from the transport-allowing location to the alignment location. a loading table configured to accommodate one or more sheets of a printing medium (P); a pickup member configured to pick up a sheet from the loading table ; an alignment member pivotable to an alignment location for blocking and aligning fore-ends of a sheet on the loading table , and to a transport-allowing location for allowing a sheet picked up by the pickup member to be transported; a cam gear comprising a gear portion partially including a tooth-omitted portion , and a cam portion configured to switch the alignment member between the alignment location and the transport-allowing location at first and second rotating locations of the cam gear ; a main gear ; a swing arm pivotable about a same axis as a rotation axis of the main gear ; and first and second swing gears supported by the swing arm to interlock with the main gear , configured to selectively interlock with the gear portion according to a rotating direction of the main gear , and to rotate the cam gear to the first and second rotating locations; characterized by comprising: a holder configured to support the pickup member and be pivotable to a pickup location for allowing the pickup member to contact the sheet on the loading table , and a separating location for spacing the pickup member apart from the sheet on the loading table ; and a first elastic member configured to apply to the holder an elastic force in a direction allowing the holder to be pivoted to the pickup location, a holder configured to support the pickup member and be pivotable to a pickup location for allowing the pickup member to contact the sheet on the loading table , and a separating location for spacing the pickup member apart from the sheet on the loading table ; and a first elastic member configured to apply to the holder an elastic force in a direction allowing the holder to be pivoted to the pickup location, wherein the alignment member is configured to apply a force to the holder such that the holder is pivoted to the separating location, when the alignment member is switched from the transport-allowing location to the alignment location. <EOS>