Mode control and nonlinear effect suppression are technical problems to obtain 10 kW-level fiber laser with high beam quality. For the purpose of high beam quality and output power, a counter-tandem-pumped fiber laser employing a double clad fiber with a fiber core diameter of 30 μm and a clad diameter of 250 μm is demonstrated. A laser output with an output power of 10.03 kW, a beam quality factor M² of 1.92, and a Raman inhibition ratio of 38 dB is achieved. A beam quality factor M² better than 2 is realized, which confirms the possibility of generation and amplification of 10 kW-level fiber laser of high beam quality with conventional double clad fibers.