A sheet conveying apparatus comprising a pair of rollers configured to pinch a sheet to be conveyed, a driving source, a roller mechanism configured to change a clearance between the pair of rollers with a force generated by the driving source, and a manual mechanism including an operation member which a user manually moves and a transmission mechanism configured to transmit a manual force from the operation member to the roller mechanism to change the clearance between the pair of rollers, wherein the transmission mechanism is configured to cut off transmission of the force generated by the driving source to the operation member when the manual mechanism is in a default state.