About one-fifth of Japanese companies have no female managers and most say women account for less than 10% of management, a Reuters monthly poll found, highlighting the struggle for the government's "womenomics" drive to make headway.

The survey results come as Japan is seen to delay its target this year to raise the share of women in leadership posts to 30% as part of the government's campaign to empower women, dubbed womenomics, and cope with Japan's aging population.

The Reuters Corporate Survey, conducted Sept. 29-Oct. 8, found 71% of Japanese firms said women accounted for less than 10% of management, while 17% had no female managers at all.