A photochromic diarylethene derivative having pyrazole and benzothiophene was synthesized and its photochromic behavior and thermal properties were investigated. Upon irradiation with UV light, two kinds of colored isomers were generated at once. One of the colored isomers was thermally stable, the other returned to the initial colorless isomer by heating. We found that the diarylethene derivative exhibits dual-mode photochromism of T- and P-types.