Sheet conveyance apparatus and image forming apparatus

A sheet conveyance apparatus comprising:

• a conveyance unit configured to convey a sheet;
• a guide member disposed to define a conveyance path through which a sheet is conveyed;
• a light-emitting element configured to emit light;
• a light-receiving element configured to output a detection signal that changes in accordance with an amount of received light;
• a first light-passing portion disposed to define an optical path from the light-emitting element to the conveyance path;
• and
• a second light-passing portion disposed to define an optical path from the conveyance path to the light-receiving element,
• wherein the light-receiving element is configured such that the detection signal changes in accordance with whether or not a sheet is present in the conveyance path, and
• wherein reflectance of each of the first light-passing portion and the second light-passing portion to the light emitted from the light-emitting element is higher than reflectance of the guide member to the light emitted from the light-emitting element.