Jenny Edwards CBE, Chief Executive at the charity said: "Despite growing awareness, there are sadly still too many people who don't feel safe talking about their mental health at work".
The study also approached managers and employers to assess their view of mental health in the workplace in contrast to the views of their employees.
Reasons for the problems varied, as 36% said that the death of loved ones was a crucial factor, while 24% stated that their own ill health was an important reason, with 27% adding that financial issues caused them to suffer poor mental health.
Older people also tend to find it more hard to talk about their mental health, as it was a more stigmatised topic when they were growing up, as depression and anxiety were often seen as a sign of weakness.
The Director of UWA's Centre for Transformative Work Design, Professor Sharon Parker, believes that; "poorly designed work can take a heavy toll on workers' mental health, whereas when work is well-designed, employees will not only be healthier but more productive as well". World Health Organization forecasts that the prevalence of depression, as one of the more prominent mental illnesses, will increase.
And Alistair Burns, national clinical director for Dementia at NHS England, added: "Depression and anxiety affect almost eight million people over 55, but can often go unnoticed and untreated".
Dr Ashley Weinberg, co-author of the report said: "Poorly designed jobs, work that is not well organised and challenging work environments can trigger or exacerbate mental health conditions".
"Workplaces have the potential to impact on people's mental health both positively and negatively".
The study revealed around one in five have witnessed phrases linked to mental health being used in a derogatory way at work.
"Anxiety and depression are potentially serious mental health conditions for people of all ages and must be treated as such".
Prime Minister Theresa May said: 'I want to use the power of Government as a force for good to transform the way we deal with mental health problems right across society, and at every stage of life.
Twenty eight per cent have had a member of staff come to them with concerns surrounding their mental health, but only 42 per cent are certain which procedures to follow when a mental health issue is raised.
This year the 10 October marks World Mental Health Day and the World Health Organisation constitution states that "health is a state of complete physical, mental or social well-being and not merely the absence of disease or infirmity".