Abstract: Objective: This study aimed to investigate the effects of sodium metabisulfite soaking on the quality of durian seed flour and its application in producing dakak-dakak (West Sumatra’s traditional snack). Materials and Methods: The concentrations of sodium metabisulfite used in this study were: A (0.7%), B (0.6%), C (0.5%), D (0.4%) and E (0%, as control). The parameters observed include water content, ash content, protein content, fat content, carbohydrate content, sulfite residue, flour yield, gelatinization temperature, water absorption, color, oil absorption and product acceptance by sensory analysis. Results: Sodium metabisulfite soaking significantly influenced almost all quality parameters of durian seed flour. The best quality of flour was obtained using formula A with flour yield 21.22%, water absorption 247.42%, water content 8.28%, ash 1.07%, fat 1.15%, protein 2.61%, carbohydrate 87.24%, sulfite residue 62.28 ppm and lightness (77.73). However, with regard to final product acceptance of dakak-dakak based on sensory analysis, formula B was the best. Conclusion: Our results indicated that the use of sodium metabisulfite improved the quality of durian seed flour and the final product of dakak-dakak.