At London 2012, Tanaka was the women's artistic gymnastics team captain. The Japanese women's team finished eighth in the team all-around with a score of 166.646. Tanaka qualified for the individual all-around, where she finished 16th with a score of 55.632: 14.166 on vault, 14.500 on uneven bars, 13.700 on balance beam and 13.266 on floor exercise.