Men's health scores were also 3.5 per cent lower when they were the sole breadwinner.
Christin Munsch, an assistant professor in sociology at the university, said: "A lot of what we know about how gender plays out in marriage focuses on the ways in which women are disadvantaged.
"For example, women are more likely to be victims of domestic violence, and they still perform the lion's share of housework.
"Our study contributes to a growing body of research that demonstrates the ways in which gendered expectations are harmful for men too. Men are expected to be breadwinners, yet providing for one's family with little or no help has negative repercussions."
She said results that showed being a breadwinner had the opposite effect on women could be explained by the cultural pressures on men.
"Men who make a lot more money than their partners may approach breadwinning with a sense of obligation and worry about maintaining breadwinner status," she said. "Women, on the other hand, may approach breadwinning as an opportunity or choice. Breadwinning women may feel a sense of pride, without worrying what others will say if they can't or don't maintain it."
Although being a breadwinner improved women's emotional health, it had no impact on their physical health.
The researchers considered several alternative explanations, including age, education, income, number of hours worked and whether or not the couple had children - but none of these could explain their findings.
Professor Munsch said the results were good news as modern couples tended to share the burden of work and looking after the family. She added: "Whereas men's psychological well-being and health tend to increase as their wives take on more economic responsibility, women's psychological well-being also improves as they take on more economic responsibility."