NEW MATERIAL:A baker's yeast having ≤10 n mol/min/mg dry cell invertase activity, free from decomposition of fructo-oligosaccharides and capable of sucrose fermentation.

EXAMPLE: Saccharomyces cerevisiae FNF1 (FERM BP-2563).

USE: Used for production of bread. Capable of providing high-quality bread having a high ratio of residual fructo-oligosaccharides (oligosaccharide).

PREPARATION: For example, a conjugation type α having a high expansion force of bread dough and capable of fermentation of sucrose and oligosaccharides is selected from spored strains of baker's yeast available in the market and crossed with a conjugation type (a) free from fermentation of sucrose and oligosaccharides to obtain YOY103 strain. A strain capable of fermentation of sucrose without fermentation of oligosaccharides is then selected therefrom and crossing is carried out between a spored strain of the conjugation type (a) and a spored strain of the conjugation type α among the above selected strains. From the resultant strain, the objective yeast is selected.