A new experimental technique utilizing a high-spin isomer beam (HSIB) has been developed. The HSIB of 1 7 4 Hf was produced by the 9 Be( 1 7 0 Er, 5n) 1 7 4 Hf reaction in inverse kinematics. By using the HSIB, the Coulomb excitation of theK π = 8 - isomer in 1 7 4 Hf was measured. The γ-rays from the 9 - level, which is the first excited state built on the isomer, were observed as well as the cascade γ-rays of the ground-state rotational band. From the measured γ-ray yield, a value of 2 ± 1 e 2 b 2 was extracted for the B(E2 : 8 - → 9 - ). This is the first experiment of γ-ray spectroscopy by means of the HSIB-induced secondary reactions.