A sheet supplying apparatus, comprising: a loading table configured to accommodate one or more sheets of a printing medium; 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 (181, 182) 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; 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 (181, 182) 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.