PURPOSE: To enable surface culture excellent in culture efficiency using simple equipment and operation by fixing and arranging a flat platy carrier on a liquid surface, applying productive microorganisms and increasing the gas-liquid interface.

CONSTITUTION: In surface culture, a flat platy carrier 2 such as hydrophilic or hydrophobic membrane or wire net, worked into a sheetlike form is fixed and arranged on a liquid surface and productive microorganisms such as a yeast extract are applied to increase the gas-liquid interface and enable the surface culture.