Glucose production method and ethanol production method

An ethanol production method, comprising a fermentation step of causing glucose obtained by a glucose production method to undergo alcoholic fermentation to thereby generate ethanol,

• the glucose production method comprising:
• a preparatory step of preparing microalgae having cell walls which block starch accumulated within cells thereof from flowing out;
• and
• a saccharification step of saccharifying the starch within the cells to generate the glucose by adding a saccharifying enzyme that acts on the starch within the cells without crushing the cell walls, to the microalgae in which the cell walls have not been crushed,
• wherein the microalgae are microalgae of a Honda DREAMO strain (accession number FERM BP-22306), and
• wherein the saccharifying enzyme acts on the starch within the cells to generate glucose having a molecular weight smaller than the starch, and the glucose out to an exterior of the cells through the cell walls.