Demineralization (DM) from crab shell (CS) waste was carried out using a lactic acid-producing bacterium, Lactobacillus paracasei subsp. tolerans KCTC-3074 for 7 days at 25, 30, and $35^{circ}C$. DM rates were $89{sim}92%$ and slightly affected by temperature. DM was also performed for four particle-sized shell samples ($0.84{sim}3.35$, $3.35{sim}10$, $10{sim}20$, and $20{sim}35;mm$) with 10% inoculum, 5% shell, and 10% glucose at $30^{circ}C$ and 180 rpm for 7 days. It was found out that the shell size had a slight effect on the rate of DM. Negative relationships were found between DM and residual dry weight ($r^2$ = 0.960), and between DM and pH ($r^2$ = 0.906). Conversely, positive relationships were found between DM and medium protein ($r^2$ = 0.696), and between DM and total titratable acidity ($r^2$ = 0.630).