TOKYO – It shouldn’t be surprising that Panasonic’s star manager for developing appliances for women is female — except that this is Japan, a nation notorious for holding back women in the workplace.

The beauty products that Shiori Yamada has developed and runs marketing campaigns for have turned out to be hits. And that was the easiest way to silence all the male skeptics at Panasonic Corp.

One of Yamada’s popular products, the ball-shaped Nano Care humidifier billed as a skin moisturizer, sold 350,000 in a year. She came up with an improved version that works while you sleep, a feature designed to appeal to busy working women.

The formula has worked, and sales are going well. Panasonic is emerging as a pioneer in such beauty care gadgetry, with barely a rival in sight.

“All you have to do is put it beside your pillow and turn on the switch. You don’t need to do a thing,” Yamada said at the company’s Tokyo office. “Everyone wants to be beautiful, but it’s hard to find the time.”

Yamada, 36, is a rare exception in the Japanese corporate world.

Her success at Panasonic comes despite the difficulties women still face in this male-dominated culture, where women typically build opportunities by capitalizing on their gender — not by seeking a level playing field free of stereotypes.

Despite its reputation as one of Japan’s more egalitarian major companies, Panasonic had just 2,000 women among its 38,000 managers — about 5 percent — although the number of female managers at the company tripled over the past four years.

For many female managers, the beauty care division is the place to start. Panasonic ads for Nano Care are plastered on commuter trains, perfect places to catch working women’s eyes.

The posters, some of them electronic, woo on-the-go female buyers with phrases like: “I don’t have time these days to look good,” and “From busy to beautiful.”

Morra Aarons-Mele, the founder of consulting company Women Online and an expert on women’s professional development, thinks it’s not enough for a company to have smart women who know how to market to women, and says it’s more critical whether such women rise to leadership positions.

Aarons-Mele points to the “women leadership forum” — or WOLF — program at U.S. electronics retail chain Best Buy, which not only recognizes that women buy most home appliances, but also promotes women professionally and encourages networking and learning.

At Panasonic, Yamada’s booming sales record has helped another woman win promotion to Panasonic’s marketing post for electric shavers.

Although that product targets men, Panasonic figured that a quick way to get a man to buy something may be to convince his girlfriend or partner.

And so the woman manager has cast a male heartthrob singer in the new shaver ads, designed to win over women.

Whatever the wares, Yamada is confident her team of women has mastered the way to a Japanese woman’s heart — something she says her male counterparts and bosses can’t hope to match.

Kazuyo Katsuma, an economic analyst and author of hit books about empowering women, says Japan has been isolated from global changes in sexual equality for so long that it is simply not used to dealing with diversity, including foreigners and the handicapped, not just women.

Although many Japanese companies mean well and want to provide opportunities to women, the system in place isn’t set up to allow that, and most women who have been working full time quit after giving birth to their first child, she said.

“Change is going to take a generation,” she said, adding that Japan’s economic slowdown, which has cut down on lucrative job opportunities, has an increasing number of women in their 20s and 30s looking to become housewives.

“But if you look at the economic indicators for women in Japan, we are not going backward compared to 10 years ago. It’s just that progress has been slow compared to the rapid progress elsewhere.”

Katsuma says penalties have to be set up, not just goals, to force companies to change to allow women to work. Labor laws also need to be changed so that Japanese men will cut down on their workaholic hours, she said.

“You can’t expect Panasonic to completely change Japanese culture by itself,” she said.