Polyhydroxyalkanoate (PHA) is a microbial origin (inedible origin) plastic, which expected to deal effectively with the food security issue. In this study, in order to use PHA for industrial and machinery parts and products, a polycaprolactone (PCL) pellet was blended with a PHA-based pellet to improve ductility and tensile strength because PCL is a bioabsorbable and biodegradable polymer having high ductility. When the mixing ratio of PCL was 50%, the elongation at break of polymer blend was large and the gauge area of tensile test specimens whitened in the case of static tensile tests, whereas the elongation at break of polymer blend was very small in the case of dynamic tensile tests.